WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 08/25/2003

Class	Cusip	Orig Prin Bal	Begin Prin Bal	Int Rate Accrued	Int Rate Paid	Int Dist	Prin Dist	Int Shortfall	Prin Loss	Deferred Interest	Int Reimbursed	Unscheduled Int	Prin Reimbursed	Total Dist	Ending Class Bal
IA	9292276V3	$51,519,000.00	$51,314,666.31	4.5000000000%	4.5000000000%	$192,430.00	$1,743,227.88	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,935,657.87	$49,571,438.43
IIA1	9292276W1	$99,000,000.00	$96,510,126.01	5.0000000000%	5.0000000000%	$402,125.53	$5,103,822.69	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$5,505,948.22	$91,406,303.32
IIA2	9292276X9	$70,000,000.00	$68,239,483.04	4.5000000000%	4.5000000000%	$255,898.06	$3,608,763.52	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$3,864,661.58	$64,630,719.52
IIA3	9292276Y7	$273,871,000.00	$266,983,077.98	4.7500000000%	4.7500000000%	$1,056,808.02	$14,119,081.06	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$15,175,889.08	$252,863,996.92
IIA4	9292276Z4	$37,822,000.00	$36,870,767.53	1.5250000000%	1.5250000000%	$46,856.60	$1,949,866.48	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,996,723.08	$34,920,901.05
IIA5	9292277A8	$37,822,000.00	$36,870,767.53	6.4750000000%	6.4750000000%	$198,948.52	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$198,948.52	$34,920,901.05
IIA6	9292277B6	$50,000,000.00	$48,742,487.88	3.4400000000%	3.4400000000%	$139,728.47	$2,577,688.23	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$2,717,416.70	$46,164,799.65
IIA7	9292277C4	$15,600,000.00	$15,207,656.22	5.0000000000%	5.0000000000%	$63,365.23	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$63,365.23	$14,403,417.49
IIA8	9292277D2	$41,667,000.00	$40,619,064.85	1.5250000000%	1.5250000000%	$51,620.06	$2,148,090.71	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$2,199,710.77	$38,470,974.14
IIA9	9292277E0	$41,667,000.00	$40,619,064.85	0.0500000000%	0.0500000000%	$1,692.46	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,692.46	$38,470,974.14
IIA10	9292277F7	$25,000,000.00	$24,371,243.94	10.7083333263%	10.7083333263%	$217,479.50	$1,288,844.11	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,506,323.62	$23,082,399.83
IIA11	9292277G5	$10,000,000.00	$9,748,497.58	4.0000000000%	4.0000000000%	$32,494.99	$515,537.65	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$548,032.64	$9,232,959.93
IX	9292277H3	$2,195,579.00	$2,187,333.54	4.5000000000%	4.5000000000%	$8,202.50	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$8,202.50	$1,939,631.24
IIX	9292277J9	$19,037,622.00	$18,160,090.47	5.0000000000%	5.0000000000%	$75,667.04	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$75,667.04	$16,799,558.47
IP	9292277K6	$15,160.00	$15,100.19	0.0000000000%	0.0000000000%	$0.00	$2,848.53	$0.00	$0.00	$0.00	$0.00	$0.00	$0.39	$2,848.53	$12,252.05
IIP	9292277L4	$1,197,485.00	$1,192,343.36	0.0000000000%	0.0000000000%	$0.00	$18,422.25	$0.00	$0.00	$0.00	$0.00	$0.00	$0.77	$18,422.25	$1,173,921.88
CB1	9292277M2	$4,007,000.00	$3,992,255.83	4.9609685751%	4.9609685751%	$16,504.55	$14,819.82	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$31,324.37	$3,977,436.01
CB2	9292277N0	$1,001,000.00	$997,316.72	4.9609685751%	4.9609685751%	$4,123.05	$3,702.18	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$7,825.23	$993,614.54
CB3	9292277P5	$1,335,000.00	$1,330,087.73	4.9609685751%	4.9609685751%	$5,498.77	$4,937.47	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$10,436.24	$1,325,150.26
CB4	9292276S0	$667,000.00	$664,545.71	4.9609685751%	4.9609685751%	$2,747.33	$2,466.89	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$5,214.21	$662,078.82
CB5	9292276T8	$333,000.00	$331,774.69	4.9609685751%	4.9609685751%	$1,371.60	$1,231.59	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$2,603.20	$330,543.10
CB6	9292276U5	$674,798.72	$672,315.73	4.9609685751%	4.9609685751%	$2,779.45	$2,495.73	$0.00	$0.01	$0.00	$0.00	$0.00	$0.00	$5,275.18	$669,819.99
R	9292277Q3	$100.00	$0.00	0.0000000000%	0.0000000000%	$2.21	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$2.21	$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
Total		$668,109,543.72	$652,595,155.08			$2,776,343.93	$33,105,846.81	$0.00	$0.01	$0.00	$0.00	$0.00	$1.16	$35,882,190.74	$619,489,309.42

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 08/25/2003

Class	Orig Face	Beg Bal	Prin Loss	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IA	$51,519,000.00	$51,314,666.31	$0.00	$0.00	$1,743,227.88	0.9621972171	$49,571,438.43
IIA1	$99,000,000.00	$96,510,126.01	$0.00	$0.00	$5,103,822.69	0.9232959931	$91,406,303.32
IIA2	$70,000,000.00	$68,239,483.04	$0.00	$0.00	$3,608,763.52	0.9232959931	$64,630,719.52
IIA3	$273,871,000.00	$266,983,077.98	$0.00	$0.00	$14,119,081.06	0.9232959931	$252,863,996.92
IIA4	$37,822,000.00	$36,870,767.53	$0.00	$0.00	$1,949,866.48	0.9232959931	$34,920,901.05
IIA5	$37,822,000.00	$36,870,767.53	$0.00	$0.00	$0.00	0.9232959931	$34,920,901.05
IIA6	$50,000,000.00	$48,742,487.88	$0.00	$0.00	$2,577,688.23	0.9232959930	$46,164,799.65
IIA7	$15,600,000.00	$15,207,656.22	$0.00	$0.00	$0.00	0.9232959929	$14,403,417.49
IIA8	$41,667,000.00	$40,619,064.85	$0.00	$0.00	$2,148,090.71	0.9232959930	$38,470,974.14
IIA9	$41,667,000.00	$40,619,064.85	$0.00	$0.00	$0.00	0.9232959930	$38,470,974.14
IIA10	$25,000,000.00	$24,371,243.94	$0.00	$0.00	$1,288,844.11	0.9232959932	$23,082,399.83
IIA11	$10,000,000.00	$9,748,497.58	$0.00	$0.00	$515,537.65	0.9232959930	$9,232,959.93
IX	$2,195,579.00	$2,187,333.54	$0.00	$0.00	$0.00	0.8834258480	$1,939,631.24
IIX	$19,037,622.00	$18,160,090.47	$0.00	$0.00	$0.00	0.8824399639	$16,799,558.47
IP	$15,160.00	$15,100.19	$0.00	$0.00	$2,848.53	0.8081827177	$12,252.05
IIP	$1,197,485.00	$1,192,343.36	$0.00	$0.00	$18,422.25	0.9803228266	$1,173,921.88
CB1	$4,007,000.00	$3,992,255.83	$0.00	$0.00	$14,819.82	0.9926219142	$3,977,436.01
CB2	$1,001,000.00	$997,316.72	$0.00	$0.00	$3,702.18	0.9926219181	$993,614.54
CB3	$1,335,000.00	$1,330,087.73	$0.00	$0.00	$4,937.47	0.9926219176	$1,325,150.26
CB4	$667,000.00	$664,545.71	$0.00	$0.00	$2,466.89	0.9926219190	$662,078.82
CB5	$333,000.00	$331,774.69	$0.00	$0.00	$1,231.59	0.9926219219	$330,543.10
CB6	$674,798.72	$672,315.73	$0.01	$0.00	$2,495.73	0.9926219036	$669,819.99
R	$100.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
R_SYN	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
Total	$668,109,543.72	$652,595,155.08	$0.01	$0.00	$33,105,846.81	0.9272271520	$619,489,309.42

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 08/25/2003
PER $1000 DENOMINATION
Class	Orig Face	Beg Bal	Prin Loss	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IA	$51,519,000.00	996.03381879	0.00000000	0.00000000	33.83660164	0.9621972171	962.19721714
IIA1	$99,000,000.00	974.84975768	0.00000000	0.00000000	51.55376455	0.9232959931	923.29599313
IIA2	$70,000,000.00	974.84975771	0.00000000	0.00000000	51.55376457	0.9232959931	923.29599314
IIA3	$273,871,000.00	974.84975766	0.00000000	0.00000000	51.55376458	0.9232959931	923.29599308
IIA4	$37,822,000.00	974.84975755	0.00000000	0.00000000	51.55376448	0.9232959931	923.29599307
IIA5	$37,822,000.00	974.84975755	0.00000000	0.00000000	0.00000000	0.9232959931	923.29599307
IIA6	$50,000,000.00	974.84975760	0.00000000	0.00000000	51.55376460	0.9232959930	923.29599300
IIA7	$15,600,000.00	974.84975769	0.00000000	0.00000000	0.00000000	0.9232959929	923.29599295
IIA8	$41,667,000.00	974.84975760	0.00000000	0.00000000	51.55376461	0.9232959930	923.29599299
IIA9	$41,667,000.00	974.84975760	0.00000000	0.00000000	0.00000000	0.9232959930	923.29599299
IIA10	$25,000,000.00	974.84975760	0.00000000	0.00000000	51.55376440	0.9232959932	923.29599320
IIA11	$10,000,000.00	974.84975800	0.00000000	0.00000000	51.55376500	0.9232959930	923.29599300
IX	$2,195,579.00	996.24451682	0.00000000	0.00000000	0.00000000	0.8834258480	883.42584803
IIX	$19,037,622.00	953.90540216	0.00000000	0.00000000	0.00000000	0.8824399639	882.43996388
IP	$15,160.00	996.05474934	0.00000000	0.00000000	187.89775726	0.8081827177	808.18271768
IIP	$1,197,485.00	995.70630112	0.00000000	0.00000000	15.38411755	0.9803228266	980.32282659
CB1	$4,007,000.00	996.32039681	0.00000000	0.00000000	3.69848266	0.9926219142	992.62191415
CB2	$1,001,000.00	996.32039960	0.00000000	0.00000000	3.69848152	0.9926219181	992.62191808
CB3	$1,335,000.00	996.32039700	0.00000000	0.00000000	3.69847940	0.9926219176	992.62191760
CB4	$667,000.00	996.32040480	0.00000000	0.00000000	3.69848576	0.9926219190	992.62191904
CB5	$333,000.00	996.32039039	0.00000000	0.00000000	3.69846847	0.9926219219	992.62192192
CB6	$674,798.72	996.32039907	0.00001482	0.00000000	3.69848064	0.9926219036	992.62190361
R	$100.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
R_SYN	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 08/25/2003

Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
IA	$51,519,000.00	4.5000000000%	4.5000000000%	$51,314,666.31	$192,430.00	$0.00	$0.00	$0.00	$192,430.00
IIA1	$99,000,000.00	5.0000000000%	5.0000000000%	$96,510,126.01	$402,125.53	$0.00	$0.00	$0.00	$402,125.53
IIA2	$70,000,000.00	4.5000000000%	4.5000000000%	$68,239,483.04	$255,898.06	$0.00	$0.00	$0.00	$255,898.06
IIA3	$273,871,000.00	4.7500000000%	4.7500000000%	$266,983,077.98	$1,056,808.02	$0.00	$0.00	$0.00	$1,056,808.02
IIA4	$37,822,000.00	1.5250000000%	1.5250000000%	$36,870,767.53	$46,856.60	$0.00	$0.00	$0.00	$46,856.60
IIA5	$37,822,000.00	6.4750000000%	6.4750000000%	$36,870,767.53	$198,948.52	$0.00	$0.00	$0.00	$198,948.52
IIA6	$50,000,000.00	3.4400000000%	3.4400000000%	$48,742,487.88	$139,728.47	$0.00	$0.00	$0.00	$139,728.47
IIA7	$15,600,000.00	5.0000000000%	5.0000000000%	$15,207,656.22	$63,365.23	$0.00	$0.00	$0.00	$63,365.23
IIA8	$41,667,000.00	1.5250000000%	1.5250000000%	$40,619,064.85	$51,620.06	$0.00	$0.00	$0.00	$51,620.06
IIA9	$41,667,000.00	0.0500000000%	0.0500000000%	$40,619,064.85	$1,692.46	$0.00	$0.00	$0.00	$1,692.46
IIA10	$25,000,000.00	10.7083333263%	10.7083333263%	$24,371,243.94	$217,479.50	$0.00	$0.00	$0.00	$217,479.50
IIA11	$10,000,000.00	4.0000000000%	4.0000000000%	$9,748,497.58	$32,494.99	$0.00	$0.00	$0.00	$32,494.99
IX	$2,195,579.00	4.5000000000%	4.5000000000%	$2,187,333.54	$8,202.50	$0.00	$0.00	$0.00	$8,202.50
IIX	$19,037,622.00	5.0000000000%	5.0000000000%	$18,160,090.47	$75,667.04	$0.00	$0.00	$0.00	$75,667.04
IP	$15,160.00	0.0000000000%	0.0000000000%	$15,100.19	$0.00	$0.00	$0.00	$0.00	$0.00
IIP	$1,197,485.00	0.0000000000%	0.0000000000%	$1,192,343.36	$0.00	$0.00	$0.00	$0.00	$0.00
CB1	$4,007,000.00	4.9609685751%	4.9609685751%	$3,992,255.83	$16,504.55	$0.00	$0.00	$0.00	$16,504.55
CB2	$1,001,000.00	4.9609685751%	4.9609685751%	$997,316.72	$4,123.05	$0.00	$0.00	$0.00	$4,123.05
CB3	$1,335,000.00	4.9609685751%	4.9609685751%	$1,330,087.73	$5,498.77	$0.00	$0.00	$0.00	$5,498.77
CB4	$667,000.00	4.9609685751%	4.9609685751%	$664,545.71	$2,747.33	$0.00	$0.00	$0.00	$2,747.33
CB5	$333,000.00	4.9609685751%	4.9609685751%	$331,774.69	$1,371.60	$0.00	$0.00	$0.00	$1,371.60
CB6	$674,798.72	4.9609685751%	4.9609685751%	$672,315.73	$2,779.45	$0.00	$0.00	$0.00	$2,779.45
R	$100.00	0.0000000000%	0.0000000000%	$0.00	$2.21	$0.00	$0.00	$0.00	$2.21
R_SYN	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
Total	$668,109,543.72			$652,595,155.08	$2,776,343.93	$0.00	$0.00	$0.00	$2,776,343.93

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 08/25/2003
PER $1000 DENOMINATION
Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
IA	$51,519,000.00	4.5000000000%	4.5000000000%	996.03381879	3.73512685	0.00000000	0.00000000	0.00000000	3.73512685
IIA1	$99,000,000.00	5.0000000000%	5.0000000000%	974.84975768	4.06187404	0.00000000	0.00000000	0.00000000	4.06187404
IIA2	$70,000,000.00	4.5000000000%	4.5000000000%	974.84975771	3.65568657	0.00000000	0.00000000	0.00000000	3.65568657
IIA3	$273,871,000.00	4.7500000000%	4.7500000000%	974.84975766	3.85878030	0.00000000	0.00000000	0.00000000	3.85878030
IIA4	$37,822,000.00	1.5250000000%	1.5250000000%	974.84975755	1.23887156	0.00000000	0.00000000	0.00000000	1.23887156
IIA5	$37,822,000.00	6.4750000000%	6.4750000000%	974.84975755	5.26012691	0.00000000	0.00000000	0.00000000	5.26012691
IIA6	$50,000,000.00	3.4400000000%	3.4400000000%	974.84975760	2.79456940	0.00000000	0.00000000	0.00000000	2.79456940
IIA7	$15,600,000.00	5.0000000000%	5.0000000000%	974.84975769	4.06187372	0.00000000	0.00000000	0.00000000	4.06187372
IIA8	$41,667,000.00	1.5250000000%	1.5250000000%	974.84975760	1.23887153	0.00000000	0.00000000	0.00000000	1.23887153
IIA9	$41,667,000.00	0.0500000000%	0.0500000000%	974.84975760	0.04061872	0.00000000	0.00000000	0.00000000	0.04061872
IIA10	$25,000,000.00	10.7083333263%	10.7083333263%	974.84975760	8.69918000	0.00000000	0.00000000	0.00000000	8.69918000
IIA11	$10,000,000.00	4.0000000000%	4.0000000000%	974.84975800	3.24949900	0.00000000	0.00000000	0.00000000	3.24949900
IX	$2,195,579.00	4.5000000000%	4.5000000000%	996.24451682	3.73591659	0.00000000	0.00000000	0.00000000	3.73591659
IIX	$19,037,622.00	5.0000000000%	5.0000000000%	953.90540216	3.97460565	0.00000000	0.00000000	0.00000000	3.97460565
IP	$15,160.00	0.0000000000%	0.0000000000%	996.05474934	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIP	$1,197,485.00	0.0000000000%	0.0000000000%	995.70630112	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
CB1	$4,007,000.00	4.9609685751%	4.9609685751%	996.32039681	4.11892937	0.00000000	0.00000000	0.00000000	4.11892937
CB2	$1,001,000.00	4.9609685751%	4.9609685751%	996.32039960	4.11893107	0.00000000	0.00000000	0.00000000	4.11893107
CB3	$1,335,000.00	4.9609685751%	4.9609685751%	996.32039700	4.11892884	0.00000000	0.00000000	0.00000000	4.11892884
CB4	$667,000.00	4.9609685751%	4.9609685751%	996.32040480	4.11893553	0.00000000	0.00000000	0.00000000	4.11893553
CB5	$333,000.00	4.9609685751%	4.9609685751%	996.32039039	4.11891892	0.00000000	0.00000000	0.00000000	4.11891892
CB6	$674,798.72	4.9609685751%	4.9609685751%	996.32039907	4.11893194	0.00000000	0.00000000	0.00000000	4.11893194
R	$100.00	0.0000000000%	0.0000000000%	0.00000000	22.10000000	0.00000000	0.00000000	0.00000000	22.10000000
R_SYN	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
SERIES: WAMU 03S6 WEIGHTED AVERAGE PC RATE: 5.10518%
POOL NUMBER: Group 1(2136,2137)
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:	1324		$652,595,156.23
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$2,422,876.55
Unscheduled Principal Collection/Reversals		$565,407.54
Liquidations-in-full	59	$30,117,562.72
Net principal Distributed		$33,105,846.81	-$33,105,846.81

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	1265		$619,489,309.42

SCHEDULED INTEREST AT MORTGAGE RATE:		$2,912,301.52

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
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
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$135,957.59

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:		$35,882,190.74

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
SERIES: WAMU 03S6 WEIGHTED AVERAGE PC RATE: 4.68815%
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:	107		$51,953,355.77
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$199,653.65
Unscheduled Principal Collection/Reversals		$115,485.23
Liquidations-in-full	3	$1,433,333.53
Net principal Distributed		$1,748,472.41	-$1,748,472.41

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	104		$50,204,883.36

SCHEDULED INTEREST AT MORTGAGE RATE:		$213,794.55

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
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
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$10,823.57

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:		$1,951,443.39

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
SERIES: WAMU 03S6 WEIGHTED AVERAGE PC RATE: 5.14125%
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:	1217		$600,641,800.46
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$2,223,222.90
Unscheduled Principal Collection/Reversals		$449,922.31
Liquidations-in-full	56	$28,684,229.19
Net principal Distributed		$31,357,374.40	-$31,357,374.40

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	1161		$569,284,426.06

SCHEDULED INTEREST AT MORTGAGE RATE:		$2,698,506.97

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
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
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$125,134.02

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:		$33,930,747.35

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
SERIES: WAMU 03S6 WEIGHTED AVERAGE PC RATE: 5.10518%
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:	1324		$652,595,156.23
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$2,422,876.55
Unscheduled Principal Collection/Reversals		$565,407.54
Liquidations-in-full	59	$30,117,562.72
Net principal Distributed		$33,105,846.81	-$33,105,846.81

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	1265		$619,489,309.42

SCHEDULED INTEREST AT MORTGAGE RATE:		$2,912,301.52

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
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
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$135,957.59

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:		$35,882,190.74

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 08/25/2003

Distribution by Group
Pool ID		Principal		Interest		Total
Group 1(2136,2137)		$33,105,846.81		$2,776,343.93		$35,882,190.74
Pool - 2136		$1,748,472.41		$202,970.98		$1,951,443.39
Pool - 2137		$31,357,374.40		$2,573,372.95		$33,930,747.35
Aggregate		$33,105,846.81		$2,776,343.93		$35,882,190.74

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
Group 1(2136,2137)	$652,595,156.23	1324	59	1265	$619,489,309.42	$2,422,876.55	$30,117,562.72	$565,407.54	$33,105,846.81
Pool - 2136	$51,953,355.77	107	3	104	$50,204,883.36	$199,653.65	$1,433,333.53	$115,485.23	$1,748,472.41
Pool - 2137	$600,641,800.46	1217	56	1161	$569,284,426.06	$2,223,222.90	$28,684,229.19	$449,922.31	$31,357,374.40
Aggregate	$652,595,156.23	1324	59	1265	$619,489,309.42	$2,422,876.55	$30,117,562.72	$565,407.54	$33,105,846.81

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
Group 1(2136,2137)	8	$4,296,609.40	0	$0.00	0	$0.00	0	$0.00
Pool - 2136	0	$0.00	0	$0.00	0	$0.00	0	$0.00
Pool - 2137	8	$4,296,609.40	0	$0.00	0	$0.00	0	$0.00
Aggregate	8	$4,296,609.40	0	$0.00	0	$0.00	0	$0.00

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

Aggregate Loss Amounts by Group
Pool ID			Count			Loss Amount
Group 1(2136,2137)			0			$0.00
Aggregate			0			$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 08/25/2003

INSURANCE RESERVES - Group 1(2136,2137)
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	$0.00	$0.00	$0.00	$0.00	$0.00
Bankruptcy Bond
Single-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$0.00	$0.00	$0.00	$0.00	$0.00

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	$0.00	$0.00	$0.00	$0.00	$0.00
Bankruptcy Bond
Single-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$0.00	$0.00	$0.00	$0.00	$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 08/25/2003

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 200308 are as follows:

Class			Class Principal Balance
CB1			$3,977,436.01
CB2			$993,614.54
CB3			$1,325,150.26
CB4			$662,078.82
CB5			$330,543.10
CB6			$669,819.99
Total			$7,958,642.71
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 $0.00, $0.00, $0.00 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