30 Home Runs: 34 times home, 17 times road.

34 times a player has hit at least 30 home runs at home in a season, two in 2017:

Rk	I	Player	Year	HR	AB	AB/HR	HRtot	Road
1		Hank Greenberg	1938	39	277	7.1	58	19
2		Mark McGwire	1998	38	263	6.9	70	32
3		Barry Bonds	2001	37	224	6.1	73	36
4		Mark McGwire	1999	37	260	7.0	65	28
5		Jimmie Foxx	1938	35	274	7.8	50	15
6		Sammy Sosa	1998	35	310	8.9	66	31
7		Alex Rodriguez	2002	34	313	9.2	57	23
8		Sammy Sosa	2001	34	281	8.3	64	30
9		Ted Kluszewski	1954	34	290	8.5	49	15
10		Hack Wilson	1930	33	289	8.8	56	23
11		Sammy Sosa	1999	33	308	9.3	63	30
12		Jose Bautista	2010	33	262	7.9	54	21
		Aaron Judge	2017	33	269	8.2	52	19
13		Andres Galarraga	1996	32	320	10.0	47	15
14		Ken Williams	1922	32	295	9.2	39	7
15		Babe Ruth	1921	32	256	8.0	59	27
16		Dante Bichette	1995	31	302	9.7	40	9
17		Jimmie Foxx	1933	31	274	8.8	48	17
18		Hank Aaron	1971	31	243	7.8	47	16
19		Ralph Kiner	1948	31	278	9.0	40	9
20		Jimmie Foxx	1932	31	283	9.1	58	27
		Giancarlo Stanton	2017	31	272	8.8	59	28
21		Ernie Banks	1958	30	300	10.0	47	17
22		Johnny Bench	1970	30	308	10.3	45	15
23		Jim Thome	2001	30	253	8.4	49	19
24		Mark McGwire	1997	30	248	8.3	58	28
25		Ken Griffey	1998	30	315	10.5	56	26
26		Frank Thomas	2000	30	291	9.7	43	13
27		Carlos Delgado	2000	30	283	9.4	41	11
28		Roger Maris	1961	30	280	9.3	61	31
29		Mark Teixeira	2005	30	311	10.4	43	13
30		Hal Trosky	1936	30	326	10.9	42	12
31		Jim Thome	2002	30	246	8.2	52	22
32		Lou Gehrig	1934	30	290	9.7	49	19

In 1922 Ken Williams of the St. Louis Browns (now Baltimore Orioles) led the American League in Home Runs with 39. He has the most HR at home with single digit on the road. That's also the only total less than 40 among the 34 above.

17 times a player has hit at least 30 home runs on the road in a season, half the number of times at home:

Rk	I	Player	Year	HR	AB	AB/HR	HRtot	Home
1		Barry Bonds	2001	36	252	7.0	73	37
2		Babe Ruth	1927	32	287	9.0	60	28
3		David Ortiz	2006	32	291	9.1	54	22
4		Mark McGwire	1998	32	246	7.7	70	38
5		Luis Gonzalez	2001	31	308	9.9	57	26
6		Roger Maris	1961	31	310	10.0	61	30
7		George Foster	1977	31	319	10.3	52	21
8		Brady Anderson	1996	31	279	9.0	50	19
9		Sammy Sosa	1998	31	333	10.7	66	35
10		Shawn Green	2001	30	320	10.7	49	19
11		Jim Gentile	1961	30	258	8.6	46	16
12		Mickey Mantle	1961	30	284	9.5	54	24
13		Jeff Bagwell	1999	30	285	9.5	42	12
14		Sammy Sosa	2001	30	296	9.9	64	34
15		Andruw Jones	2005	30	305	10.2	51	21
16		Sammy Sosa	1999	30	317	10.6	63	33
17		Eddie Mathews	1953	30	300	10.0	47	17

Jeff Bagwell had the fewest at home and the lowest total. Some surprises in players who did not benefit from their home park as is often assumed:
Babe Ruth: 1927  60 home runs
Roger Maris: 1961  61 home runs
Brady Anderson: 1996; lowest percent at home for at least 50 homers
Sammy Sosa: all three years he hit at least 60 Sosa hit at least 30 both home and road but more on the road all three times.