WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S9
Distribution Date: 12/27/2004

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
A1	92922FEN4	$6,250,000.00	$6,250,000.00	5.2500000000%	5.2500000000%	$27,343.75	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$27,343.75	$6,250,000.00
A2	92922FEP9	$32,814,769.00	$27,117,042.33	2.7375000000%	2.7375000000%	$61,860.75	$575,716.16	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$637,576.92	$26,541,326.17
A3	92922FEQ7	$32,814,769.00	$27,117,042.33	5.2625000000%	5.2625000000%	$118,919.53	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$118,919.53	$26,541,326.17
A4	92922FER5	$10,000,000.00	$8,404,458.60	5.5000000000%	5.5000000000%	$38,520.44	$161,218.51	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$199,738.94	$8,243,240.09
A5	92922FES3	$185,481,231.00	$153,345,963.38	4.7500000000%	4.7500000000%	$606,994.44	$3,247,048.18	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$3,854,042.62	$150,098,915.20
A6	92922FET1	$17,900,000.00	$17,900,000.00	5.2500000000%	5.2500000000%	$78,312.50	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$78,312.50	$17,900,000.00
A7	92922FEU8	$17,000,000.00	$14,794,207.34	5.2500000000%	5.2500000000%	$64,724.66	$162,775.34	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$227,500.00	$14,631,432.00
A8	92922FEV6	$35,000,000.00	$37,205,792.66	5.2500000000%	5.2500000000%	$162,775.34	($162,775.34)	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$37,368,568.00
A9	92922FEW4	$5,000,000.00	$5,000,000.00	5.2500000000%	5.2500000000%	$21,875.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$21,875.00	$5,000,000.00
A10	92922FEX2	$24,210,000.00	$24,210,000.00	5.2500000000%	5.2500000000%	$105,918.75	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$105,918.75	$24,210,000.00
A11	92922FEY0	$2,690,000.00	$2,690,000.00	5.2500000000%	5.2500000000%	$11,768.75	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$11,768.75	$2,690,000.00
X	92922FEZ7	$13,998,093.00	$11,202,933.35	5.2500000000%	5.2500000000%	$49,012.83	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$49,012.83	$11,081,169.56
P	92922FFA1	$4,737,680.29	$4,514,934.16	0.0000000000%	0.0000000000%	$0.00	$34,056.09	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$34,056.09	$4,480,878.07
B1	92922FFB9	$4,728,000.00	$4,652,510.89	5.2500000000%	5.2500000000%	$20,354.74	$5,621.25	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$25,975.98	$4,646,889.64
B2	92922FFC7	$1,575,000.00	$1,549,852.93	5.2500000000%	5.2500000000%	$6,780.61	$1,872.56	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$8,653.17	$1,547,980.37
B3	92922FFD5	$1,226,000.00	$1,206,425.20	5.2500000000%	5.2500000000%	$5,278.11	$1,457.62	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$6,735.73	$1,204,967.58
B4	92922FEK0	$525,000.00	$516,617.64	5.2500000000%	5.2500000000%	$2,260.20	$624.19	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$2,884.39	$515,993.45
B5	92922FEL8	$526,000.00	$517,601.67	5.2500000000%	5.2500000000%	$2,264.51	$625.38	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$2,889.88	$516,976.29
B6	92922FEM6	$525,387.89	$516,999.33	5.2500000000%	5.2500000000%	$2,261.87	$624.73	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.08	$0.00	$2,886.60	$516,374.68
R	92922FFE3	$100.00	$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
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		$350,189,168.18	$310,392,406.13			$1,387,226.77	$4,028,864.67	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.08	$0.00	$5,416,091.44	$306,363,541.54

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S9
Distribution Date: 12/27/2004

Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
A1	$6,250,000.00	$6,250,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	1.0000000000	$6,250,000.00
A2	$32,814,769.00	$27,117,042.33	$0.00	$0.00	$0.00	$0.00	$575,716.16	0.8088225814	$26,541,326.17
A3	$32,814,769.00	$27,117,042.33	$0.00	$0.00	$0.00	$0.00	$0.00	0.8088225814	$26,541,326.17
A4	$10,000,000.00	$8,404,458.60	$0.00	$0.00	$0.00	$0.00	$161,218.51	0.8243240090	$8,243,240.09
A5	$185,481,231.00	$153,345,963.38	$0.00	$0.00	$0.00	$0.00	$3,247,048.18	0.8092404519	$150,098,915.20
A6	$17,900,000.00	$17,900,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	1.0000000000	$17,900,000.00
A7	$17,000,000.00	$14,794,207.34	$0.00	$0.00	$0.00	$0.00	$162,775.34	0.8606724706	$14,631,432.00
A8	$35,000,000.00	$37,205,792.66	$0.00	$0.00	$0.00	$0.00	($162,775.34)	1.0676733714	$37,368,568.00
A9	$5,000,000.00	$5,000,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	1.0000000000	$5,000,000.00
A10	$24,210,000.00	$24,210,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	1.0000000000	$24,210,000.00
A11	$2,690,000.00	$2,690,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	1.0000000000	$2,690,000.00
X	$13,998,093.00	$11,202,933.35	$0.00	$0.00	$0.00	$0.00	$0.00	0.7916199414	$11,081,169.56
P	$4,737,680.29	$4,514,934.16	$0.00	$0.00	$0.00	$0.00	$34,056.09	0.9457957894	$4,480,878.07
B1	$4,728,000.00	$4,652,510.89	$0.00	$0.00	$0.00	$0.00	$5,621.25	0.9828446785	$4,646,889.64
B2	$1,575,000.00	$1,549,852.93	$0.00	$0.00	$0.00	$0.00	$1,872.56	0.9828446794	$1,547,980.37
B3	$1,226,000.00	$1,206,425.20	$0.00	$0.00	$0.00	$0.00	$1,457.62	0.9828446819	$1,204,967.58
B4	$525,000.00	$516,617.64	$0.00	$0.00	$0.00	$0.00	$624.19	0.9828446667	$515,993.45
B5	$526,000.00	$517,601.67	$0.00	$0.00	$0.00	$0.00	$625.38	0.9828446578	$516,976.29
B6	$525,387.89	$516,999.33	$0.00	$0.08	$0.00	$0.00	$624.73	0.9828446560	$516,374.68
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	$350,189,168.18	$310,392,406.13	$0.00	$0.08	$0.00	$0.00	$4,028,864.67	0.8748515642	$306,363,541.54

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S9
Distribution Date: 12/27/2004
PER $1000 DENOMINATION
Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
A1	$6,250,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
A2	$32,814,769.00	826.36700353	0.00000000	0.00000000	0.00000000	0.00000000	17.54442215	0.8088225814	808.82258138
A3	$32,814,769.00	826.36700353	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.8088225814	808.82258138
A4	$10,000,000.00	840.44586000	0.00000000	0.00000000	0.00000000	0.00000000	16.12185100	0.8243240090	824.32400900
A5	$185,481,231.00	826.74652607	0.00000000	0.00000000	0.00000000	0.00000000	17.50607413	0.8092404519	809.24045194
A6	$17,900,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
A7	$17,000,000.00	870.24749059	0.00000000	0.00000000	0.00000000	0.00000000	9.57502000	0.8606724706	860.67247059
A8	$35,000,000.00	1,063.02264743	0.00000000	0.00000000	0.00000000	0.00000000	-4.65072400	1.0676733714	1,067.67337143
A9	$5,000,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
A10	$24,210,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
A11	$2,690,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
X	$13,998,093.00	800.31853982	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.7916199414	791.61994137
P	$4,737,680.29	952.98413646	0.00000000	0.00000000	0.00000000	0.00000000	7.18834702	0.9457957894	945.79578944
B1	$4,728,000.00	984.03360618	0.00000000	0.00000000	0.00000000	0.00000000	1.18892766	0.9828446785	982.84467851
B2	$1,575,000.00	984.03360635	0.00000000	0.00000000	0.00000000	0.00000000	1.18892698	0.9828446794	982.84467937
B3	$1,226,000.00	984.03360522	0.00000000	0.00000000	0.00000000	0.00000000	1.18892333	0.9828446819	982.84468189
B4	$525,000.00	984.03360000	0.00000000	0.00000000	0.00000000	0.00000000	1.18893333	0.9828446667	982.84466667
B5	$526,000.00	984.03359316	0.00000000	0.00000000	0.00000000	0.00000000	1.18893536	0.9828446578	982.84465779
B6	$525,387.89	984.03358707	0.00000000	0.00015227	0.00000000	0.00000000	1.18908336	0.9828446560	982.84465597
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.03S9
Distribution Date: 12/27/2004

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
A1	$6,250,000.00	5.2500000000%	5.2500000000%	$6,250,000.00	$27,343.75	$0.00	$0.00	$0.00	$0.00	$0.00	$27,343.75
A2	$32,814,769.00	2.7375000000%	2.7375000000%	$27,117,042.33	$61,860.75	$0.00	$0.00	$0.00	$0.00	$0.00	$61,860.75
A3	$32,814,769.00	5.2625000000%	5.2625000000%	$27,117,042.33	$118,919.53	$0.00	$0.00	$0.00	$0.00	$0.00	$118,919.53
A4	$10,000,000.00	5.5000000000%	5.5000000000%	$8,404,458.60	$38,520.44	$0.00	$0.00	$0.00	$0.00	$0.00	$38,520.44
A5	$185,481,231.00	4.7500000000%	4.7500000000%	$153,345,963.38	$606,994.44	$0.00	$0.00	$0.00	$0.00	$0.00	$606,994.44
A6	$17,900,000.00	5.2500000000%	5.2500000000%	$17,900,000.00	$78,312.50	$0.00	$0.00	$0.00	$0.00	$0.00	$78,312.50
A7	$17,000,000.00	5.2500000000%	5.2500000000%	$14,794,207.34	$64,724.66	$0.00	$0.00	$0.00	$0.00	$0.00	$64,724.66
A8	$35,000,000.00	5.2500000000%	5.2500000000%	$37,205,792.66	$162,775.34	$0.00	$0.00	$0.00	$0.00	$0.00	$162,775.34
A9	$5,000,000.00	5.2500000000%	5.2500000000%	$5,000,000.00	$21,875.00	$0.00	$0.00	$0.00	$0.00	$0.00	$21,875.00
A10	$24,210,000.00	5.2500000000%	5.2500000000%	$24,210,000.00	$105,918.75	$0.00	$0.00	$0.00	$0.00	$0.00	$105,918.75
A11	$2,690,000.00	5.2500000000%	5.2500000000%	$2,690,000.00	$11,768.75	$0.00	$0.00	$0.00	$0.00	$0.00	$11,768.75
X	$13,998,093.00	5.2500000000%	5.2500000000%	$11,202,933.35	$49,012.83	$0.00	$0.00	$0.00	$0.00	$0.00	$49,012.83
P	$4,737,680.29	0.0000000000%	0.0000000000%	$4,514,934.16	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
B1	$4,728,000.00	5.2500000000%	5.2500000000%	$4,652,510.89	$20,354.74	$0.00	$0.00	$0.00	$0.00	$0.00	$20,354.74
B2	$1,575,000.00	5.2500000000%	5.2500000000%	$1,549,852.93	$6,780.61	$0.00	$0.00	$0.00	$0.00	$0.00	$6,780.61
B3	$1,226,000.00	5.2500000000%	5.2500000000%	$1,206,425.20	$5,278.11	$0.00	$0.00	$0.00	$0.00	$0.00	$5,278.11
B4	$525,000.00	5.2500000000%	5.2500000000%	$516,617.64	$2,260.20	$0.00	$0.00	$0.00	$0.00	$0.00	$2,260.20
B5	$526,000.00	5.2500000000%	5.2500000000%	$517,601.67	$2,264.51	$0.00	$0.00	$0.00	$0.00	$0.00	$2,264.51
B6	$525,387.89	5.2500000000%	5.2500000000%	$516,999.33	$2,261.87	$0.00	$0.00	$0.00	$0.00	$0.00	$2,261.87
R	$100.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
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	$350,189,168.18			$310,392,406.13	$1,387,226.77	$0.00	$0.00	$0.00	$0.00	$0.00	$1,387,226.77

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S9
Distribution Date: 12/27/2004
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
A1	$6,250,000.00	5.2500000000%	5.2500000000%	1,000.00000000	4.37500000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.37500000
A2	$32,814,769.00	2.7375000000%	2.7375000000%	826.36700353	1.88514964	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.88514964
A3	$32,814,769.00	5.2625000000%	5.2625000000%	826.36700353	3.62396365	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.62396365
A4	$10,000,000.00	5.5000000000%	5.5000000000%	840.44586000	3.85204400	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.85204400
A5	$185,481,231.00	4.7500000000%	4.7500000000%	826.74652607	3.27253834	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.27253834
A6	$17,900,000.00	5.2500000000%	5.2500000000%	1,000.00000000	4.37500000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.37500000
A7	$17,000,000.00	5.2500000000%	5.2500000000%	870.24749059	3.80733294	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.80733294
A8	$35,000,000.00	5.2500000000%	5.2500000000%	1,063.02264743	4.65072400	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.65072400
A9	$5,000,000.00	5.2500000000%	5.2500000000%	1,000.00000000	4.37500000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.37500000
A10	$24,210,000.00	5.2500000000%	5.2500000000%	1,000.00000000	4.37500000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.37500000
A11	$2,690,000.00	5.2500000000%	5.2500000000%	1,000.00000000	4.37500000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.37500000
X	$13,998,093.00	5.2500000000%	5.2500000000%	800.31853982	3.50139337	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.50139337
P	$4,737,680.29	0.0000000000%	0.0000000000%	952.98413646	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
B1	$4,728,000.00	5.2500000000%	5.2500000000%	984.03360618	4.30514805	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.30514805
B2	$1,575,000.00	5.2500000000%	5.2500000000%	984.03360635	4.30514921	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.30514921
B3	$1,226,000.00	5.2500000000%	5.2500000000%	984.03360522	4.30514682	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.30514682
B4	$525,000.00	5.2500000000%	5.2500000000%	984.03360000	4.30514286	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.30514286
B5	$526,000.00	5.2500000000%	5.2500000000%	984.03359316	4.30515209	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.30515209
B6	$525,387.89	5.2500000000%	5.2500000000%	984.03358707	4.30514301	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.30514301
R	$100.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
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
12/2004 DISTRIBUTION REPORT
SERIES: WAMU 03S9
WEIGHTED AVERAGE PC RATE: 5.36312%
WEIGHTED AVERAGE MATURITY: 339.34466
WEIGHTED AVERAGE LOAN AGE: 15.95811
POOL NUMBER: 2229
ISSUE DATE: 09/23/2003
CERTIFICATE BALANCE AT ISSUE: $350,189,168.18
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	663		$310,392,406.14
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$375,463.98
Unscheduled Principal Collection/Reversals		$115,080.40
Liquidations-in-full	8	$3,538,320.21
Subsequent Recoveries		$0.00
Net principal Distributed		$4,028,864.59	-$4,028,864.59

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	655		$306,363,541.55

SCHEDULED INTEREST AT MORTGAGE RATE:		$1,451,891.79

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
12/2004 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$64,664.94

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:		$5,416,091.44

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2004 DISTRIBUTION REPORT
SERIES: WAMU 03S9
WEIGHTED AVERAGE PC RATE: 5.36312%
WEIGHTED AVERAGE MATURITY: 339.34466
WEIGHTED AVERAGE LOAN AGE: 15.95811
POOL NUMBER: ALL
ISSUE DATE: 09/23/2003
CERTIFICATE BALANCE AT ISSUE: $350,189,168.18
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	663		$310,392,406.14
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$375,463.98
Unscheduled Principal Collection/Reversals		$115,080.40
Liquidations-in-full	8	$3,538,320.21
Subsequent Recoveries		$0.00
Net principal Distributed		$4,028,864.59	-$4,028,864.59

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	655		$306,363,541.55

SCHEDULED INTEREST AT MORTGAGE RATE:		$1,451,891.79

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
12/2004 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$64,664.94

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:		$5,416,091.44

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S9
Distribution Date: 12/27/2004

Distribution by Group
Pool ID		Principal		Interest		Total
Pool - 2229		$4,028,864.59		$1,387,226.85		$5,416,091.44
Aggregate		$4,028,864.59		$1,387,226.85		$5,416,091.44

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 - 2229	$310,392,406.14	663	8	655	$306,363,541.55	$375,463.98	$3,538,320.21	$115,080.40	$4,028,864.59
Aggregate	$310,392,406.14	663	8	655	$306,363,541.55	$375,463.98	$3,538,320.21	$115,080.40	$4,028,864.59

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 - 2229	4	$1,784,308.63	0	$0.00	0	$0.00	0	$0.00
Aggregate	4	$1,784,308.63	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
Pool - 2229		0		$0.00		0		$0.00
Aggregate		0		$0.00		0		$0.00

Aggregate Loss Amounts by Group
Pool ID			Count			Loss Amount
Pool - 2229			0			$0.00
Aggregate			0			$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S9
Distribution Date: 12/27/2004

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	$3,861,980.00	$0.00	$0.00	$0.00	$3,861,980.00
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	$3,501,891.68	$0.00	$0.00	$0.00	$3,501,891.68

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	$3,861,980.00	$0.00	$0.00	$0.00	$3,861,980.00
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	$3,501,891.68	$0.00	$0.00	$0.00	$3,501,891.68

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S9
Distribution Date: 12/27/2004

The Group 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 Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated September 19,2003 to that certain Prospectus Supplement, dated September 19,2003, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.



The Class Principal Balances of each Class of the Class B1,B2,B3,B4,B5,B6 Certificatesimmediately after the principal and interest distribution on 200412 are as follows:

Class			Class Principal Balance
B1			$4,646,889.64
B2			$1,547,980.37
B3			$1,204,967.58
B4			$515,993.45
B5			$516,976.29
B6			$516,374.68
Total			$8,949,182.02
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 $3,861,980.00, $100,000.00, $3,501,891.68 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."

WAMU MORTGAGE PASS THROUGH CERTS SER 2003-S9 8-K