american league highest single season obp

The Boston Red Sox have the best on-base percentage by an AL team in a season, with an on-base percentage of .385 in 1950.

	TEAM	OBP	SEASON	G	W%	W	L	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	SLG	OPS
1	Red Sox	.385	1950	154	.610	94	60	5,516	1,027	1,665	287	61	161	974	719	25	580	32	17	6,322	2,557	509	62			153	.302	.464	.848
2	Tigers	.385	1921	154	.464	71	82	5,456	887	1,723	270	99	58	793	581	29	373	95	89	6,293	2,365	427	227				.316	.433	.818
3	Yankees	.384	1930	154	.558	86	68	5,447	1,062	1,683	298	110	152	985	644	19	569	91	60	6,272	2,657	560	162				.309	.488	.872
4	Yankees	.384	1927	155	.714	110	44	5,354	976	1,644	291	103	158	907	642	22	610	90	64	6,222	2,615	552	204				.307	.488	.872
5	Indians	.383	1921	154	.610	94	60	5,376	925	1,657	355	91	42	847	619	37	373	51	42	6,264	2,320	488	232				.308	.432	.815
6	Yankees	.383	1931	155	.614	94	59	5,608	1,067	1,667	276	78	155	990	750	28	554	139	68	6,473	2,564	509	87				.297	.457	.840
7	Red Sox	.381	1949	155	.623	96	58	5,320	896	1,500	272	36	131	835	835	17	510	43	25	6,250	2,237	439	78			169	.282	.420	.802
8	Yankees	.381	1936	155	.667	102	51	5,591	1,065	1,676	315	83	182	997	700	33	593	77	40	6,391	2,703	580	67				.300	.483	.864
9	Indians	.381	1923	153	.536	82	71	5,277	886	1,591	301	75	59	806	626	49	381	79	79	6,150	2,219	435	198				.301	.421	.801
10	Tigers	.380	1925	156	.526	81	73	5,371	903	1,623	277	84	50	798	639	32	384	97	63	6,262	2,218	411	220				.302	.413	.793
11	Red Sox	.378	1938	150	.591	88	61	5,229	902	1,566	298	56	98	860	649	13	462	55	51	6,003	2,270	452	112				.299	.434	.812
12	Tigers	.377	1936	154	.539	83	71	5,464	921	1,638	326	55	94	847	646	34	462	73	49	6,232	2,356	475	88				.300	.431	.808
13	Tigers	.377	1923	155	.539	83	71	5,261	833	1,579	269	69	41	739	592	56	384	87	62	6,166	2,109	379	257				.300	.401	.778
14	Indians	.376	1920	154	.636	98	56	5,203	856	1,575	301	95	35	757	574	36	376	73	93	6,067	2,171	431	254				.303	.417	.793
15	Yankees	.376	1932	156	.695	107	47	5,476	1,002	1,564	279	82	160	954	765	27	526	77	66	6,344	2,487	521	76				.286	.454	.830
16	Tigers	.376	1934	154	.656	101	53	5,471	959	1,643	349	53	74	871	636	24	526	125	55	6,232	2,320	476	101				.300	.424	.800
17	Tigers	.374	1924	156	.558	86	68	5,382	849	1,604	315	76	35	769	617	40	395	100	76	6,263	2,176	426	224				.298	.404	.779
18	Yankees	.374	1994	113	.619	70	43	3,986	670	1,155	238	16	139	632	530	31	660	55	40	4,611	1,842	393	27	37	34	112	.290	.462	.836
19	Senators	.374	1925	152	.636	96	55	5,191	828	1,576	251	71	56	747	541	44	420	135	92	5,984	2,137	378	208				.304	.412	.786
20	Yankees	.374	1939	152	.702	106	45	5,300	967	1,521	259	55	166	904	701	36	543	72	37	6,129	2,388	480	92			99	.287	.451	.825
21	Red Sox	.374	1948	155	.619	96	59	5,363	907	1,471	277	40	121	854	821	32	549	38	17	6,282	2,191	438	66			144	.274	.409	.782
22	Yankees	.374	1921	153	.641	98	55	5,250	948	1,576	284	87	134	875	575	41	571	89	64	6,056	2,436	505	190				.300	.464	.838
23	White Sox	.374	1936	153	.536	81	70	5,466	920	1,597	282	56	60	862	684	26	419	66	29	6,283	2,171	398	107				.292	.397	.771
24	Indians	.373	1999	162	.599	97	65	5,634	1,009	1,629	309	32	209	960	743	55	1,099	147	50	6,553	2,629	550	54	67	41	136	.289	.467	.840
25	Athletics	.373	1927	155	.591	91	63	5,287	841	1,606	281	70	56	767	553	30	325	101	63	6,089	2,195	407	219				.304	.415	.788