most home runs in a calendar day by all teams combined

The New York Yankees have launched the most homers by a team in a day, with 13 homers on June 28, 1939.

	TEAM	HR	DAY	W%	W	L	AB	R	H	2B	3B	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Yankees	13	6/28/1939	1.000	2	0	98	33	43	5	0	32	10	0	2	3		109	87	18	1			0	.439	.491	.888	1.378
2	Twins	12	8/29/1963	1.000	2	0	87	24	35	1	2	23	5	0	11	0	0	94	76	15	2	0	0	0	.402	.435	.874	1.308
3	Braves	12	8/30/1953	1.000	2	0	82	30	32	1	2	27	8	0	5	0	1	93	73	15	3			0	.390	.444	.890	1.335
4	Twins	11	4/20/2019	1.000	2	0	82	22	28	9	0	22	3	1	14	0	0	86	70	20	0	0	0	0	.341	.372	.854	1.226
5	Blue Jays	10	9/14/1987	1.000	1	0	44	18	21	2	0	18	4	0	4	0	0	48	53	12	0	0	0	1	.477	.521	1.205	1.725
6	Yankees	9	3/29/2025	1.000	1	0	40	20	16	2	0	20	8	2	5	0	0	51	45	11	0	1	0	0	.400	.510	1.125	1.635
7	Reds	9	9/4/1999	1.000	1	0	47	22	19	3	0	22	8	1	8	0	0	56	49	12	0	0	0	0	.404	.500	1.043	1.543
8	Yankees	9	4/14/1974	.500	1	1	74	15	23	1	0	15	9	2	6	1	1	87	51	10	1	1	1	1	.311	.395	.689	1.085
9	Indians	9	7/17/1966	1.000	2	0	85	22	34	2	1	22	1	1	14	0	1	87	65	12	0	0	0	1	.400	.414	.765	1.178
10	Braves	9	5/30/1956	.500	1	1	78	20	29	1	0	19	11	1	13	0	0	92	57	10	1	1	0	2	.372	.451	.731	1.181
11	Giants	9	8/13/1939	1.000	2	0	65	17	21	0	1	14	12	1	7	2		79	50	10	1			3	.323	.436	.769	1.205
12	Yankees	9	5/22/1930	1.000	2	0	89	30	39	7	0	29	11	1	11	3		104	73	16	3				.438	.505	.820	1.325
13	Athletics	8	7/14/2024	1.000	1	0	40	18	15	2	1	18	5	0	5	0	1	46	43	11	0	1	0	0	.375	.435	1.075	1.510
14	Cardinals	8	9/24/2021	1.000	2	0	66	20	26	4	0	20	5	1	16	1	0	72	54	12	0	0	0	2	.394	.444	.818	1.263
15	Blue Jays	8	9/11/2021	1.000	2	0	63	22	24	4	0	22	8	0	6	1	0	74	52	12	1	2	0	0	.381	.438	.825	1.264
16	Dodgers	8	7/10/2021	1.000	1	0	44	22	21	2	1	22	8	1	4	0	0	53	49	11	0	0	0	2	.477	.566	1.114	1.680
17	Blue Jays	8	6/13/2021	1.000	1	0	44	18	20	3	0	18	4	0	7	1	0	49	47	11	0	1	0	3	.455	.490	1.068	1.558
18	Nationals	8	8/18/2019	1.000	1	0	40	16	19	2	1	16	4	0	3	0	0	46	47	11	2	0	0	1	.475	.523	1.175	1.698
19	Diamondbacks	8	6/10/2019	1.000	1	0	40	13	14	1	0	13	6	0	9	1	0	46	39	9	0	0	0	1	.350	.435	.975	1.410
20	Twins	8	5/23/2019	1.000	1	0	43	16	17	4	0	16	6	0	7	1	0	50	45	12	0	1	0	0	.395	.460	1.047	1.507
21	Dodgers	8	3/28/2019	1.000	1	0	35	12	12	1	0	12	3	0	3	0	0	39	37	9	1	0	0	0	.343	.395	1.057	1.452
22	Phillies	8	8/22/2017	.000	0	2	68	12	16	2	0	12	4	1	20	0	0	74	42	10	0	1	0	1	.235	.284	.618	.901
23	Nationals	8	7/27/2017	1.000	1	0	42	15	19	5	0	15	5	0	9	1	0	48	48	13	1	0	0	0	.452	.511	1.143	1.653
24	Mets	8	8/24/2015	1.000	1	0	47	16	20	7	0	16	2	1	8	0	0	50	51	15	0	0	0	0	.426	.460	1.085	1.545
25	Orioles	8	6/16/2015	1.000	1	0	39	19	17	2	0	17	8	1	7	0	0	49	43	10	0	1	0	2	.436	.531	1.103	1.633