The Philadelphia Athletics have the most at-bats by a team in a month, with 1,404 at-bats in August 1938.

	TEAM	AB	MONTH	G	W%	W	L	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Athletics	1,404	August 1938	40	.375	15	25	206	399	66	21	24	202	151	4	146	15		1,586	579	111	27				.284	.355	.412	.768
2	Pirates	1,369	July 1932	38	.658	25	13	192	404	65	21	12	175	88	9	97	10		1,492	547	98	26				.295	.342	.400	.741
3	White Sox	1,360	August 1938	38	.421	16	22	190	401	67	16	17	176	108	3	133	12		1,487	551	100	16				.295	.348	.405	.753
4	Indians	1,349	August 1938	38	.395	15	23	208	363	63	30	28	187	118	4	148	17		1,484	570	121	13				.269	.330	.423	.752
5	Senators	1,345	August 1945	39	.615	24	15	177	360	55	23	12	162	143	11	107	26		1,536	497	90	37			32	.268	.343	.370	.712
6	White Sox	1,317	July 1930	37	.514	19	18	204	392	79	26	15	190	105	5	95	12		1,461	568	120	34				.298	.352	.431	.783
7	Yankees	1,291	July 1924	37	.622	23	14	222	383	63	18	32	201	121	5	92	21		1,460	578	113	43				.297	.359	.448	.807
8	Browns	1,287	August 1941	37	.588	20	14	182	343	61	8	21	174	189	4	118	9		1,501	483	90	21			25	.267	.362	.375	.737
9	Yankees	1,287	August 1935	35	.571	20	15	233	377	70	19	20	211	167	4	114	23		1,478	545	109	20				.293	.376	.423	.799
10	Indians	1,279	August 1947	36	.556	20	16	168	351	52	12	26	160	124	6	128	9		1,432	505	90	23			24	.274	.341	.395	.736
11	Yankees	1,277	July 1930	35	.486	17	18	241	375	72	17	32	218	125	4	131	12		1,439	577	121	33				.294	.358	.452	.810
12	Phillies	1,270	August 1930	35	.303	10	23	196	367	64	18	21	187	115	4	112	7		1,445	530	103	56				.289	.350	.417	.767
13	Tigers	1,269	August 1947	37	.541	20	17	189	339	50	9	22	171	181	1	138	15		1,477	473	81	26			25	.267	.359	.373	.732
14	Yankees	1,267	August 1938	36	.778	28	8	275	349	65	20	51	261	219	10	154	23		1,511	607	136	15				.275	.386	.479	.865
15	Cubs	1,265	July 1935	34	.765	26	8	236	390	82	10	24	219	98	8	81	25		1,404	564	116	33				.308	.362	.446	.808
16	Pirates	1,264	August 1943	37	.459	17	20	150	338	65	16	13	143	113	3	157	14		1,397	474	94	17			31	.267	.329	.375	.704
17	Giants	1,261	July 1932	35	.429	15	20	161	342	58	12	23	155	72	2	83	4		1,343	493	93	8				.271	.312	.391	.703
18	Senators	1,260	August 1962	37	.389	14	22	141	320	49	16	30	136	90	5	201	18	15	1,381	491	95	15	11	3	30	.254	.304	.390	.693
19	Pirates	1,256	September 1940	35	.471	16	18	184	349	69	18	15	171	116	7	135	18		1,396	499	102	17			27	.278	.342	.397	.740
20	Indians	1,254	July 1936	33	.656	21	11	244	442	97	22	34	229	82	4	81	14		1,361	685	153	21				.352	.394	.546	.940
21	Athletics	1,254	August 1935	35	.343	12	23	143	331	46	10	21	132	75	3	157	13		1,351	460	77	19				.264	.307	.367	.674
22	Yankees	1,250	July 1952	35	.571	20	15	187	356	55	13	32	171	120	9	151	5	9	1,397	533	100	18			19	.285	.352	.426	.778
23	Cardinals	1,250	September 1940	35	.618	21	13	180	346	57	12	19	171	119	3	132	33		1,394	484	88	22			17	.277	.341	.387	.728
24	Giants	1,250	June 1929	33	.636	21	12	260	410	66	14	38	242	138	8	90	24		1,447	618	118	51				.328	.398	.494	.893
25	Red Sox	1,247	August 1945	36	.361	13	23	136	305	47	12	11	125	125	5	136	16		1,401	409	70	24			31	.245	.316	.328	.644