30 or more Home Runs: 36 times at home, half that on the road. Sammy Sosa 30/30 3 times.

Generally, batters have more Plate Appearances (PA) and At Bats (AB) on the road because the winning team may not need to bat in the bottom of the 9th inning at home.

Link It contains the basic data from stathead.com plus more, including the total HR and the opposite: road for the home list and home for the road list.

In the Regular Season, from 1901 to 2023, Home (within Home or Away), requiring Home Runs >= 30, sorted by greatest Home Runs.

https://stathead.com/tiny/M0qd2  36 times; top 6:

Rk	Player	Split	Year	HR	tHR	rHR	G	GS	PA	AB	PA/HR	AB/HR
1	Hank Greenberg	Home	1938	39	58	19	79	79	343	277	8.79	7.10
2	Mark McGwire	Home	1998	38	70	32	81	79	364	263	9.58	6.92
3	Barry Bonds	Home	2001	37	73	36	75	72	310	224	8.38	6.05
4	Mark McGwire	Home	1999	37	65	28	76	76	335	260	9.05	7.03
5	Jimmie Foxx	Home	1938	35	50	15	74	74	334	274	9.54	7.83
6	Sammy Sosa	Home	1998	35	66	31	78	78	347	310	9.91	8.86

Multiple:

3: Foxx, McGwire, Sosa
2: Thome, Judge

Single digits on the road:

Player	Split	Year	HR	tHR	rHR	G	GS	PA	AB	PA/HR	AB/HR
Ken Williams	Home	1922	32	39	7	77	77	335	295	10.47	9.22
Dante Bichette	Home	1995	31	40	9	71	70	317	302	10.23	9.74
Ralph Kiner	Home	1948	31	40	9	80	80	338	278	10.90	8.97

Kiner led NL in HR SEVEN times, twice hitting 50:
1947: 51 home/road split: 28/23
1949: 54 home/road split: 29/25

In 1997 McGwire was traded during the season despite the fact that he threatened to break the home run record. McGwire hit 58: 34 for Oakland, 24 for St. Louis. McGwire led MLB in HR but neither "league". His total home/road splits: 30/28.

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In the Regular Season, from 1901 to 2023, Away (within Home or Away), requiring Home Runs >= 30, sorted by greatest Home Runs.

https://stathead.com/tiny/ILo6i  18 times; top 5:

Rk	Player	Split	Year	HR	tHR	hHR	G	GS	PA	AB	PA/HR	AB/HR
1	Barry Bonds	Away	2001	36	73	37	78	75	354	252	9.83	7.00
2	Aaron Judge	Away	2022	32	62	30	77	74	346	281	10.81	8.78
3	Mark McGwire	Away	1998	32	70	38	74	73	317	246	9.91	7.69
4	David Ortiz	Away	2006	32	54	22	77	75	353	291	11.03	9.09
5	Babe Ruth	Away	1927	32	60	28	78	78	374	287	11.69	8.97

Multiple: Sosa 3:  Sammy Sosa hit at least 30 both home and road in three seasons, the only batter to do it more than once. Here are Sosa's three and the four batters, including two Yankees, who did it once each:

Player	Split	Year	HR	tHR	rHR	G	GS	PA	AB	PA/HR	AB/HR
Sammy Sosa	Home	1998	35	66	31	78	78	347	310	9.91	8.86
Sammy Sosa	Home	1999	33	63	30	81	81	355	308	10.76	9.33
Sammy Sosa	Home	2001	34	64	30	79	79	346	281	10.18	8.26
Player	Split	Year	HR	tHR	rHR	G	GS	PA	AB	PA/HR	AB/HR
Roger Maris	Home	1961	30	61	31	79	78	325	280	10.83	9.33
Mark McGwire	Home	1998	38	70	32	81	79	364	263	9.58	6.92
Barry Bonds	Home	2001	37	73	36	75	72	310	224	8.38	6.05
Aaron Judge	Home	2022	30	62	32	80	79	350	289	11.67	9.63

The only teammates to hit at least 30 home or road in the same year were Yankees Maris and Mantle in 1961. Gentile of Baltimore also hit 30 on the road in 1961.

Player	Split	Year	HR	tHR	hHR	G	GS	PA	AB	PA/HR	AB/HR
Roger Maris	Away	1961	31	61	30	82	82	373	310	12.03	10.00
Mickey Mantle	Away	1961	30	54	24	79	78	347	284	11.57	9.47
Jim Gentile	Away	1961	30	46	16	74	70	318	258	10.60	8.60

Four batters hit at least 30 on the road in 2001:

Player	Split	Year	HR	tHR	hHR	G	GS	PA	AB	PA/HR	AB/HR
Barry Bonds	Away	2001	36	73	37	78	75	354	252	9.83	7.00
Luis Gonzalez	Away	2001	31	57	26	81	80	373	308	12.03	9.94
Sammy Sosa	Away	2001	30	64	34	81	81	365	296	12.17	9.87
Shawn Green	Away	2001	30	49	19	81	81	361	320	12.03	10.67

Road surprises:

Player	Split	Year	HR	tHR	hHR	G	GS	PA	AB	PA/HR	AB/HR
Brady Anderson	Away	1996	31	50	19	70	67	326	279	10.52	9.00
George Foster	Away	1977	31	52	21	78	78	343	319	11.06	10.29
Jeff Bagwell	Away	1999	30	42	12	80	79	373	285	12.43	9.50
Andruw Jones	Away	2005	30	51	21	81	80	341	305	11.37	10.17

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Hank Aaron: the only time he appears on either list:

Player	Split	Year	HR	tHR	rHR	G	GS	PA	AB	PA/HR	AB/HR
Henry Aaron	Home	1971	31	47	16	66	62	275	243	8.87	7.84

Those 1973 Atlanta Braves: was there something in the water?  Tuesday, August 31, 2010

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Yankees who hit at least: 25 Home Runs home or road. Details and surprises. Saturday, December 30, 2023