WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 09/27/2004

Class	Cusip	Orig Prin Bal	Begin Prin Bal	Int Rate Accrued	Int Rate Paid	Int Dist	Prin Dist	Int Shortfall	PPIS	Uncomp Int Shortfall	Prin Loss	Deferred Interest	Int Reimbursed	Unsched Int	Prin Reimbursed	Subsequent Recoveries	Total Dist	Ending Class Bal
IA	9292276V3	$51,519,000.00	$45,459,288.69	4.5000000000%	4.5000000000%	$170,472.33	$259,656.42	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$430,128.75	$45,199,632.27
IIA1	9292276W1	$99,000,000.00	$69,570,681.95	5.0000000000%	5.0000000000%	$289,877.84	$1,281,782.86	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,571,660.70	$68,288,899.09
IIA2	9292276X9	$70,000,000.00	$49,191,391.28	4.5000000000%	4.5000000000%	$184,467.72	$906,311.11	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,090,778.83	$48,285,080.17
IIA3	9292276Y7	$273,871,000.00	$192,458,507.43	4.7500000000%	4.7500000000%	$761,814.93	$3,545,890.43	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$4,307,705.36	$188,912,617.00
IIA4	9292276Z4	$37,822,000.00	$26,578,811.45	2.0250000000%	2.0250000000%	$44,851.74	$489,692.84	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$534,544.59	$26,089,118.61
IIA5	9292277A8	$37,822,000.00	$26,578,811.45	5.9750000000%	5.9750000000%	$132,340.33	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$132,340.33	$26,089,118.61
IIA6	9292277B6	$50,000,000.00	$35,136,708.04	3.4400000000%	3.4400000000%	$100,725.23	$647,365.08	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$748,090.31	$34,489,342.96
IIA7	9292277C4	$15,600,000.00	$10,962,652.91	5.0000000000%	5.0000000000%	$45,677.72	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$45,677.72	$10,760,675.00
IIA8	9292277D2	$41,667,000.00	$29,280,824.29	2.0250000000%	2.0250000000%	$49,411.39	$539,475.22	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$588,886.61	$28,741,349.07
IIA9	9292277E0	$41,667,000.00	$29,280,824.29	0.0500000000%	0.0500000000%	$1,220.03	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,220.03	$28,741,349.07
IIA10	9292277F7	$25,000,000.00	$17,568,354.02	9.8749999913%	9.8749999913%	$144,572.91	$323,682.54	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$468,255.45	$17,244,671.48
IIA11	9292277G5	$10,000,000.00	$7,027,341.62	4.0000000000%	4.0000000000%	$23,424.47	$129,473.02	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$152,897.49	$6,897,868.60
IX	9292277H3	$2,195,579.00	$1,598,874.67	4.5000000000%	4.5000000000%	$5,995.78	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$5,995.78	$1,591,237.25
IIX	9292277J9	$19,037,622.00	$11,819,803.94	5.0000000000%	5.0000000000%	$49,249.18	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$49,249.18	$11,650,885.93
IP	9292277K6	$15,160.00	$11,337.39	0.0000000000%	0.0000000000%	$0.00	$95.27	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$95.27	$11,242.12
IIP	9292277L4	$1,197,485.00	$1,060,872.08	0.0000000000%	0.0000000000%	$0.00	$5,356.19	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$5,356.19	$1,055,515.89
CB1	9292277M2	$4,007,000.00	$3,792,446.54	4.9610400934%	4.9610400934%	$15,678.73	$16,007.08	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$31,685.81	$3,776,439.46
CB2	9292277N0	$1,001,000.00	$947,401.81	4.9610400934%	4.9610400934%	$3,916.75	$3,998.77	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$7,915.52	$943,403.04
CB3	9292277P5	$1,335,000.00	$1,263,517.87	4.9610400934%	4.9610400934%	$5,223.64	$5,333.03	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$10,556.67	$1,258,184.84
CB4	9292276S0	$667,000.00	$631,285.69	4.9610400934%	4.9610400934%	$2,609.86	$2,664.52	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$5,274.38	$628,621.17
CB5	9292276T8	$333,000.00	$315,169.64	4.9610400934%	4.9610400934%	$1,302.97	$1,330.26	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$2,633.24	$313,839.38
CB6	9292276U5	$674,798.72	$638,666.80	4.9610400934%	4.9610400934%	$2,640.38	$2,695.67	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$5,336.05	$635,971.13
R	9292277Q3	$100.00	$0.00	0.0000000000%	0.0000000000%	$1.59	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1.59	$0.00
R_SYN	XXXXXXXXX	$0.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
Total		$668,109,543.72	$480,932,606.59			$2,035,475.54	$8,160,810.32	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$10,196,285.86	$472,771,796.27

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 09/27/2004

Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IA	$51,519,000.00	$45,459,288.69	$0.00	$0.00	$0.00	$0.00	$259,656.42	0.8773390840	$45,199,632.27
IIA1	$99,000,000.00	$69,570,681.95	$0.00	$0.00	$0.00	$0.00	$1,281,782.86	0.6897868595	$68,288,899.09
IIA2	$70,000,000.00	$49,191,391.28	$0.00	$0.00	$0.00	$0.00	$906,311.11	0.6897868596	$48,285,080.17
IIA3	$273,871,000.00	$192,458,507.43	$0.00	$0.00	$0.00	$0.00	$3,545,890.43	0.6897868595	$188,912,617.00
IIA4	$37,822,000.00	$26,578,811.45	$0.00	$0.00	$0.00	$0.00	$489,692.84	0.6897868598	$26,089,118.61
IIA5	$37,822,000.00	$26,578,811.45	$0.00	$0.00	$0.00	$0.00	$0.00	0.6897868598	$26,089,118.61
IIA6	$50,000,000.00	$35,136,708.04	$0.00	$0.00	$0.00	$0.00	$647,365.08	0.6897868592	$34,489,342.96
IIA7	$15,600,000.00	$10,962,652.91	$0.00	$0.00	$0.00	$0.00	$0.00	0.6897868590	$10,760,675.00
IIA8	$41,667,000.00	$29,280,824.29	$0.00	$0.00	$0.00	$0.00	$539,475.22	0.6897868594	$28,741,349.07
IIA9	$41,667,000.00	$29,280,824.29	$0.00	$0.00	$0.00	$0.00	$0.00	0.6897868594	$28,741,349.07
IIA10	$25,000,000.00	$17,568,354.02	$0.00	$0.00	$0.00	$0.00	$323,682.54	0.6897868592	$17,244,671.48
IIA11	$10,000,000.00	$7,027,341.62	$0.00	$0.00	$0.00	$0.00	$129,473.02	0.6897868600	$6,897,868.60
IX	$2,195,579.00	$1,598,874.67	$0.00	$0.00	$0.00	$0.00	$0.00	0.7247460693	$1,591,237.25
IIX	$19,037,622.00	$11,819,803.94	$0.00	$0.00	$0.00	$0.00	$0.00	0.6119927126	$11,650,885.93
IP	$15,160.00	$11,337.39	$0.00	$0.00	$0.00	$0.00	$95.27	0.7415646438	$11,242.12
IIP	$1,197,485.00	$1,060,872.08	$0.00	$0.00	$0.00	$0.00	$5,356.19	0.8814439346	$1,055,515.89
CB1	$4,007,000.00	$3,792,446.54	$0.00	$0.00	$0.00	$0.00	$16,007.08	0.9424605590	$3,776,439.46
CB2	$1,001,000.00	$947,401.81	$0.00	$0.00	$0.00	$0.00	$3,998.77	0.9424605794	$943,403.04
CB3	$1,335,000.00	$1,263,517.87	$0.00	$0.00	$0.00	$0.00	$5,333.03	0.9424605543	$1,258,184.84
CB4	$667,000.00	$631,285.69	$0.00	$0.00	$0.00	$0.00	$2,664.52	0.9424605247	$628,621.17
CB5	$333,000.00	$315,169.64	$0.00	$0.00	$0.00	$0.00	$1,330.26	0.9424606006	$313,839.38
CB6	$674,798.72	$638,666.80	$0.00	$0.00	$0.00	$0.00	$2,695.67	0.9424604866	$635,971.13
R	$100.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
R_SYN	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
Total	$668,109,543.72	$480,932,606.59	$0.00	$0.00	$0.00	$0.00	$8,160,810.32	0.7076261681	$472,771,796.27

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 09/27/2004
PER $1000 DENOMINATION
Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IA	$51,519,000.00	882.37909684	0.00000000	0.00000000	0.00000000	0.00000000	5.04001281	0.8773390840	877.33908403
IIA1	$99,000,000.00	702.73416111	0.00000000	0.00000000	0.00000000	0.00000000	12.94730162	0.6897868595	689.78685949
IIA2	$70,000,000.00	702.73416114	0.00000000	0.00000000	0.00000000	0.00000000	12.94730157	0.6897868596	689.78685957
IIA3	$273,871,000.00	702.73416108	0.00000000	0.00000000	0.00000000	0.00000000	12.94730158	0.6897868595	689.78685951
IIA4	$37,822,000.00	702.73416133	0.00000000	0.00000000	0.00000000	0.00000000	12.94730157	0.6897868598	689.78685976
IIA5	$37,822,000.00	702.73416133	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.6897868598	689.78685976
IIA6	$50,000,000.00	702.73416080	0.00000000	0.00000000	0.00000000	0.00000000	12.94730160	0.6897868592	689.78685920
IIA7	$15,600,000.00	702.73416090	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.6897868590	689.78685897
IIA8	$41,667,000.00	702.73416109	0.00000000	0.00000000	0.00000000	0.00000000	12.94730170	0.6897868594	689.78685939
IIA9	$41,667,000.00	702.73416109	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.6897868594	689.78685939
IIA10	$25,000,000.00	702.73416080	0.00000000	0.00000000	0.00000000	0.00000000	12.94730160	0.6897868592	689.78685920
IIA11	$10,000,000.00	702.73416200	0.00000000	0.00000000	0.00000000	0.00000000	12.94730200	0.6897868600	689.78686000
IX	$2,195,579.00	728.22461410	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.7247460693	724.74606926
IIX	$19,037,622.00	620.86556504	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.6119927126	611.99271264
IP	$15,160.00	747.84894459	0.00000000	0.00000000	0.00000000	0.00000000	6.28430079	0.7415646438	741.56464380
IIP	$1,197,485.00	885.91680063	0.00000000	0.00000000	0.00000000	0.00000000	4.47286605	0.8814439346	881.44393458
CB1	$4,007,000.00	946.45533816	0.00000000	0.00000000	0.00000000	0.00000000	3.99477914	0.9424605590	942.46055902
CB2	$1,001,000.00	946.45535465	0.00000000	0.00000000	0.00000000	0.00000000	3.99477522	0.9424605794	942.46057942
CB3	$1,335,000.00	946.45533333	0.00000000	0.00000000	0.00000000	0.00000000	3.99477903	0.9424605543	942.46055431
CB4	$667,000.00	946.45530735	0.00000000	0.00000000	0.00000000	0.00000000	3.99478261	0.9424605247	942.46052474
CB5	$333,000.00	946.45537538	0.00000000	0.00000000	0.00000000	0.00000000	3.99477477	0.9424606006	942.46060060
CB6	$674,798.72	946.45526299	0.00000000	0.00000000	0.00000000	0.00000000	3.99477640	0.9424604866	942.46048659
R	$100.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
R_SYN	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 09/27/2004

Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Current Int Accrued	Int Shortfall	PPIS	Uncompensated Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
IA	$51,519,000.00	4.5000000000%	4.5000000000%	$45,459,288.69	$170,472.33	$0.00	$0.00	$0.00	$0.00	$0.00	$170,472.33
IIA1	$99,000,000.00	5.0000000000%	5.0000000000%	$69,570,681.95	$289,877.84	$0.00	$0.00	$0.00	$0.00	$0.00	$289,877.84
IIA2	$70,000,000.00	4.5000000000%	4.5000000000%	$49,191,391.28	$184,467.72	$0.00	$0.00	$0.00	$0.00	$0.00	$184,467.72
IIA3	$273,871,000.00	4.7500000000%	4.7500000000%	$192,458,507.43	$761,814.93	$0.00	$0.00	$0.00	$0.00	$0.00	$761,814.93
IIA4	$37,822,000.00	2.0250000000%	2.0250000000%	$26,578,811.45	$44,851.74	$0.00	$0.00	$0.00	$0.00	$0.00	$44,851.74
IIA5	$37,822,000.00	5.9750000000%	5.9750000000%	$26,578,811.45	$132,340.33	$0.00	$0.00	$0.00	$0.00	$0.00	$132,340.33
IIA6	$50,000,000.00	3.4400000000%	3.4400000000%	$35,136,708.04	$100,725.23	$0.00	$0.00	$0.00	$0.00	$0.00	$100,725.23
IIA7	$15,600,000.00	5.0000000000%	5.0000000000%	$10,962,652.91	$45,677.72	$0.00	$0.00	$0.00	$0.00	$0.00	$45,677.72
IIA8	$41,667,000.00	2.0250000000%	2.0250000000%	$29,280,824.29	$49,411.39	$0.00	$0.00	$0.00	$0.00	$0.00	$49,411.39
IIA9	$41,667,000.00	0.0500000000%	0.0500000000%	$29,280,824.29	$1,220.03	$0.00	$0.00	$0.00	$0.00	$0.00	$1,220.03
IIA10	$25,000,000.00	9.8749999913%	9.8749999913%	$17,568,354.02	$144,572.91	$0.00	$0.00	$0.00	$0.00	$0.00	$144,572.91
IIA11	$10,000,000.00	4.0000000000%	4.0000000000%	$7,027,341.62	$23,424.47	$0.00	$0.00	$0.00	$0.00	$0.00	$23,424.47
IX	$2,195,579.00	4.5000000000%	4.5000000000%	$1,598,874.67	$5,995.78	$0.00	$0.00	$0.00	$0.00	$0.00	$5,995.78
IIX	$19,037,622.00	5.0000000000%	5.0000000000%	$11,819,803.94	$49,249.18	$0.00	$0.00	$0.00	$0.00	$0.00	$49,249.18
IP	$15,160.00	0.0000000000%	0.0000000000%	$11,337.39	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIP	$1,197,485.00	0.0000000000%	0.0000000000%	$1,060,872.08	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
CB1	$4,007,000.00	4.9610400934%	4.9610400934%	$3,792,446.54	$15,678.73	$0.00	$0.00	$0.00	$0.00	$0.00	$15,678.73
CB2	$1,001,000.00	4.9610400934%	4.9610400934%	$947,401.81	$3,916.75	$0.00	$0.00	$0.00	$0.00	$0.00	$3,916.75
CB3	$1,335,000.00	4.9610400934%	4.9610400934%	$1,263,517.87	$5,223.64	$0.00	$0.00	$0.00	$0.00	$0.00	$5,223.64
CB4	$667,000.00	4.9610400934%	4.9610400934%	$631,285.69	$2,609.86	$0.00	$0.00	$0.00	$0.00	$0.00	$2,609.86
CB5	$333,000.00	4.9610400934%	4.9610400934%	$315,169.64	$1,302.97	$0.00	$0.00	$0.00	$0.00	$0.00	$1,302.97
CB6	$674,798.72	4.9610400934%	4.9610400934%	$638,666.80	$2,640.38	$0.00	$0.00	$0.00	$0.00	$0.00	$2,640.38
R	$100.00	0.0000000000%	0.0000000000%	$0.00	$1.59	$0.00	$0.00	$0.00	$0.00	$0.00	$1.59
R_SYN	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
Total	$668,109,543.72			$480,932,606.59	$2,035,475.54	$0.00	$0.00	$0.00	$0.00	$0.00	$2,035,475.54

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 09/27/2004
PER $1000 DENOMINATION
Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	PPIS	Uncompensated Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
IA	$51,519,000.00	4.5000000000%	4.5000000000%	882.37909684	3.30892156	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.30892156
IIA1	$99,000,000.00	5.0000000000%	5.0000000000%	702.73416111	2.92805899	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	2.92805899
IIA2	$70,000,000.00	4.5000000000%	4.5000000000%	702.73416114	2.63525314	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	2.63525314
IIA3	$273,871,000.00	4.7500000000%	4.7500000000%	702.73416108	2.78165607	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	2.78165607
IIA4	$37,822,000.00	2.0250000000%	2.0250000000%	702.73416133	1.18586378	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.18586378
IIA5	$37,822,000.00	5.9750000000%	5.9750000000%	702.73416133	3.49903046	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.49903046
IIA6	$50,000,000.00	3.4400000000%	3.4400000000%	702.73416080	2.01450460	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	2.01450460
IIA7	$15,600,000.00	5.0000000000%	5.0000000000%	702.73416090	2.92805897	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	2.92805897
IIA8	$41,667,000.00	2.0250000000%	2.0250000000%	702.73416109	1.18586387	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.18586387
IIA9	$41,667,000.00	0.0500000000%	0.0500000000%	702.73416109	0.02928049	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.02928049
IIA10	$25,000,000.00	9.8749999913%	9.8749999913%	702.73416080	5.78291640	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	5.78291640
IIA11	$10,000,000.00	4.0000000000%	4.0000000000%	702.73416200	2.34244700	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	2.34244700
IX	$2,195,579.00	4.5000000000%	4.5000000000%	728.22461410	2.73084230	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	2.73084230
IIX	$19,037,622.00	5.0000000000%	5.0000000000%	620.86556504	2.58693969	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	2.58693969
IP	$15,160.00	0.0000000000%	0.0000000000%	747.84894459	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIP	$1,197,485.00	0.0000000000%	0.0000000000%	885.91680063	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
CB1	$4,007,000.00	4.9610400934%	4.9610400934%	946.45533816	3.91283504	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.91283504
CB2	$1,001,000.00	4.9610400934%	4.9610400934%	946.45535465	3.91283716	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.91283716
CB3	$1,335,000.00	4.9610400934%	4.9610400934%	946.45533333	3.91283895	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.91283895
CB4	$667,000.00	4.9610400934%	4.9610400934%	946.45530735	3.91283358	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.91283358
CB5	$333,000.00	4.9610400934%	4.9610400934%	946.45537538	3.91282282	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.91282282
CB6	$674,798.72	4.9610400934%	4.9610400934%	946.45526299	3.91284085	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.91284085
R	$100.00	0.0000000000%	0.0000000000%	0.00000000	15.90000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	15.90000000
R_SYN	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
SERIES: WAMU 03S6
WEIGHTED AVERAGE PC RATE: 4.65509%
WEIGHTED AVERAGE MATURITY: 161.24960
WEIGHTED AVERAGE LOAN AGE: 15.92762
POOL NUMBER: 2136
ISSUE DATE: 06/24/2003
CERTIFICATE BALANCE AT ISSUE: $52,160,134.72
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	101		$46,061,919.68
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$201,383.28
Unscheduled Principal Collection/Reversals		$60,953.24
Liquidations-in-full	0	$0.00
Subsequent Recoveries		$0.00
Net principal Distributed		$262,336.52	-$262,336.52

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	101		$45,799,583.16

SCHEDULED INTEREST AT MORTGAGE RATE:		$188,281.67

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Interest Uncollected on Prepayment		$0.00
Uncompensated Uncollected Interest		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$9,596.22

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$441,021.97

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
SERIES: WAMU 03S6
WEIGHTED AVERAGE PC RATE: 5.12370%
WEIGHTED AVERAGE MATURITY: 161.65517
WEIGHTED AVERAGE LOAN AGE: 15.92039
POOL NUMBER: 2137
ISSUE DATE: 06/24/2003
CERTIFICATE BALANCE AT ISSUE: $615,949,409.00
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	943		$434,870,686.97
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$1,830,080.09
Unscheduled Principal Collection/Reversals		$1,085,013.33
Liquidations-in-full	12	$4,983,380.38
Subsequent Recoveries		$0.00
Net principal Distributed		$7,898,473.80	-$7,898,473.80

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	931		$426,972,213.17

SCHEDULED INTEREST AT MORTGAGE RATE:		$1,947,388.17

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Interest Uncollected on Prepayment		$0.00
Uncompensated Uncollected Interest		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$90,598.08

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$9,755,263.89

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
SERIES: WAMU 03S6
WEIGHTED AVERAGE PC RATE: 5.07882%
WEIGHTED AVERAGE MATURITY: 161.61588
WEIGHTED AVERAGE LOAN AGE: 15.92109
POOL NUMBER: Group 1
ISSUE DATE: 06/24/2003
CERTIFICATE BALANCE AT ISSUE: $668,109,543.72
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	1044		$480,932,606.65
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$2,031,463.37
Unscheduled Principal Collection/Reversals		$1,145,966.57
Liquidations-in-full	12	$4,983,380.38
Subsequent Recoveries		$0.00
Net principal Distributed		$8,160,810.32	-$8,160,810.32

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	1032		$472,771,796.33

SCHEDULED INTEREST AT MORTGAGE RATE:		$2,135,669.84

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Interest Uncollected on Prepayment		$0.00
Uncompensated Uncollected Interest		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$100,194.30

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$10,196,285.86

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
SERIES: WAMU 03S6
WEIGHTED AVERAGE PC RATE: 5.07882%
WEIGHTED AVERAGE MATURITY: 161.61588
WEIGHTED AVERAGE LOAN AGE: 15.92109
POOL NUMBER: ALL
ISSUE DATE: 06/24/2003
CERTIFICATE BALANCE AT ISSUE: $668,109,543.72
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	1044		$480,932,606.65
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$2,031,463.37
Unscheduled Principal Collection/Reversals		$1,145,966.57
Liquidations-in-full	12	$4,983,380.38
Subsequent Recoveries		$0.00
Net principal Distributed		$8,160,810.32	-$8,160,810.32

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	1032		$472,771,796.33

SCHEDULED INTEREST AT MORTGAGE RATE:		$2,135,669.84

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Interest Uncollected on Prepayment		$0.00
Uncompensated Uncollected Interest		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$100,194.30

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$10,196,285.86

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 09/27/2004

Distribution by Group
Pool ID		Principal		Interest		Total
Pool - 2136		$262,336.52		$178,685.45		$441,021.97
Pool - 2137		$7,898,473.80		$1,856,790.09		$9,755,263.89
Group 1		$8,160,810.32		$2,035,475.54		$10,196,285.86
Aggregate		$8,160,810.32		$2,035,475.54		$10,196,285.86

Number of Loans and Aggregate Principal Balance By Group
Pool ID	Beg Bal	Beg Count	Paid Off / Liq Count	Rem Count	Sched Prin End Bal	Sched Prin	Prin PrePay / Liq	Unsched Prin / Rev	Total Prin
Pool - 2136	$46,061,919.68	101	0	101	$45,799,583.16	$201,383.28	$0.00	$60,953.24	$262,336.52
Pool - 2137	$434,870,686.97	943	12	931	$426,972,213.17	$1,830,080.09	$4,983,380.38	$1,085,013.33	$7,898,473.80
Group 1	$480,932,606.65	1044	12	1032	$472,771,796.33	$2,031,463.37	$4,983,380.38	$1,145,966.57	$8,160,810.32
Aggregate	$480,932,606.65	1044	12	1032	$472,771,796.33	$2,031,463.37	$4,983,380.38	$1,145,966.57	$8,160,810.32

Delinquency Information by Group
Pool ID	1 Month Count	Sched End Balance	2 Months Count	Sched End Balance	3 Months Count	Sched End Balance	4 Months Count	Sched End Balance
Pool - 2136	0	$0.00	0	$0.00	0	$0.00	0	$0.00
Pool - 2137	0	$0.00	1	$843,939.21	0	$0.00	0	$0.00
Group 1	0	$0.00	1	$843,939.21	0	$0.00	0	$0.00
Aggregate	0	$0.00	1	$843,939.21	0	$0.00	0	$0.00

Foreclosure and REO Information by Group
Pool ID		Foreclosure Count		Sched End Balance		REO Count		Sched End Balance
Pool - 2136		0		$0.00		0		$0.00
Pool - 2137		0		$0.00		0		$0.00
Group 1		0		$0.00		0		$0.00
Aggregate		0		$0.00		0		$0.00

Aggregate Loss Amounts by Group
Pool ID			Count			Loss Amount
Pool - 2136			0			$0.00
Pool - 2137			0			$0.00
Group 1			0			$0.00
Aggregate			0			$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 09/27/2004

INSURANCE RESERVES - Group 1
Insurance Type	Original Balance	Claims In Progress	Claims Paid	Coverage Adjustments	Coverage Remaining
MPI	$0.00	$0.00	$0.00	$0.00	$0.00
Special Hazard	$6,681,095.00	$0.00	$0.00	$0.00	$6,681,095.00
Bankruptcy Bond
Single-Units	$100,000.00	$0.00	$0.00	$0.00	$100,000.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$6,681,095.00	$0.00	$0.00	$0.00	$6,681,095.00

INSURANCE RESERVES - Aggregate
Insurance Type	Original Balance	Claims In Progress	Claims Paid	Coverage Adjustments	Coverage Remaining
MPI	$0.00	$0.00	$0.00	$0.00	$0.00
Special Hazard	$6,681,095.00	$0.00	$0.00	$0.00	$6,681,095.00
Bankruptcy Bond
Single-Units	$100,000.00	$0.00	$0.00	$0.00	$100,000.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$6,681,095.00	$0.00	$0.00	$0.00	$6,681,095.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 09/27/2004

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I,and II Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated June 20,2003 to that certain Prospectus Supplement, dated May 20, 2003, to which certain Group I,and II Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I,and II Loans, subject to the conditions and limitations to payment specified thereunder.



The Class Principal Balances of each Class of the Class CB1,CB2,CB3,CB4,CB5,CB6 Certificatesimmediately after the principal and interest distribution on 200409 are as follows:

Class			Class Principal Balance
CB1			$3,776,439.46
CB2			$943,403.04
CB3			$1,258,184.84
CB4			$628,621.17
CB5			$313,839.38
CB6			$635,971.13
Total			$7,556,459.01
Capitalized items used but not defined herein have the meanings ascribed to them in the Prospectus Supplement.
The amount of the special hazard coverage, bankruptcy coverage, and fraud coverage, as of the above referenced distribution date, is $6,681,095.00, $100,000.00, $6,681,095.00 respectively, and such coverages are referred to in the table above under the column "Insurance Type" as "special hazard," "bankruptcy bond," and "mortgage repurchase," respectively. However, no policy of insurance exists for any such coverage, notwithstanding the reference to "insurance."

WASHINGTON MUTUAL MORT SEC CORP WAMU MO PA TH CE SE 03 S6 8-K