Park factor and the season home run record.

Unfortunately, I do not have a home run (HR) park factor.  If someone knows of one, please let me know.  The park factor that we do have is based on runs scored with 100 being neutral.  It might be interesting to look at the batting park factor (BPF) for the seasons when the HR record was set starting in 1915.

Click link to view data.  These posts are relevant:

Saturday, December 8, 2012
Season Home Run record 1: Bonds, McGwire, Maris, Ruth, Craveth.

Saturday, December 8, 2012
Season Home Run record 2: Bonds, McGwire, Maris.
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No home/road at bat (AB) splits for Craveth but here are the HR rates for the others; lower is better and in bold.  Babe Ruth is the only one with a better HR rate on the road in a HR record setting season.  Ruth did it in two of his four seasons: 1919 and 1927.

                                                 home road
Player Year        HR B L Team AB/HR AB/HR
Craveth 1915     24 R A PHI
Ruth  1919         29 L A BOS  22.22 11.60
Ruth  1920         54 L A NYY 7.00 10.16
Ruth  1921         59 L A NYY 8.00 10.56
Ruth  1927         60 L A NYY 9.04 8.97
Maris 1961 61 L A NYY 9.33 10.00
McGwire 1998 70 R N STL   6.92 7.69
Bonds 2001 73 L N SFG   6.05 7.00

Year	L	park	name	Attend	BPF	PPF	G	R	RperG
1915	AL	Navin Field	Detroit Tigers	0,476,105	105	103	156	778	4.987
1915	AL	Comiskey Park	Chicago White Sox	0,539,461	103	102	155	717	4.626
1915	AL	Griffith Stadium I	Washington Senators	0,167,332	102	101	155	569	3.671
1915	AL	League Park II	Cleveland Indians	0,159,285	102	104	154	539	3.500
1915	AL	Polo Grounds IV	New York Yankees	0,256,035	100	100	154	584	3.792
1915	AL	Fenway Park I	Boston Red Sox	0,539,885	97	95	155	669	4.316
1915	AL	Sportsman's Park IV	St. Louis Browns	0,150,358	96	98	159	521	3.277
1915	AL	Shibe Park	Philadelphia Athletics	0,146,223	96	99	154	545	3.539

Cravath's Philadelphia park was tied for last in BPF and fifth in Runs per Game; last in attendance.  Cravath hit 19 of his 24 HR at home.  I just don't know the number of at bats (AB) home v. road.
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Year	L	park	name	Attend	BPF	PPF	G	R	RperG
1919	AL	League Park II	Cleveland Indians	0,538,135	106	104	139	636	4.576
1919	AL	Sportsman's Park IV	St. Louis Browns	0,349,350	102	103	140	533	3.807
1919	AL	Shibe Park	Philadelphia Athletics	0,225,209	101	106	140	457	3.264
1919	AL	Polo Grounds IV	New York Yankees	0,619,164	101	99	141	578	4.099
1919	AL	Comiskey Park	Chicago White Sox	0,627,186	100	99	140	667	4.764
1919	AL	Griffith Stadium I	Washington Senators	0,234,096	99	99	142	533	3.754
1919	AL	Navin Field	Detroit Tigers	0,643,805	98	100	140	618	4.414
1919	AL	Fenway Park I	Boston Red Sox	0,417,291	94	94	138	564	4.087

Ruth's home park was dead last in BPF, although his Red Sox were fifth in runs per game and attendance.  Ruth hit only 9 of his 29 HR at home.
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Year	L	park	name	Attend	BPF	PPF	G	R	RperG
1920	AL	Polo Grounds IV	New York Yankees	1,289,422	104	101	154	838	5.442
1920	AL	League Park II	Cleveland Indians	0,912,832	104	101	154	857	5.565
1920	AL	Sportsman's Park IV	St. Louis Browns	0,419,311	103	103	154	797	5.175
1920	AL	Shibe Park	Philadelphia Athletics	0,287,888	101	106	156	558	3.577
1920	AL	Comiskey Park	Chicago White Sox	0,833,492	99	99	154	794	5.156
1920	AL	Griffith Stadium I	Washington Senators	0,359,260	97	98	153	723	4.725
1920	AL	Navin Field	Detroit Tigers	0,579,650	97	98	155	652	4.206
1920	AL	Fenway Park I	Boston Red Sox	0,402,445	96	96	154	650	4.221

Ruth's new team, the New York Yankees shared the Polo Grounds with the NL Giants 1913-1922.  In 1920 Polo Grounds and the Cleveland park had the highest BPF.  Cleveland led in runs per game, Yanks second but Yanks became the first team to draw over one million people at home.  In case you were wondering here's how the Polo Grounds did in the NL:

Year	L	park	name	Attend	BPF	PPF	G	R	RperG
1920	NL	Baker Bowl	Philadelphia Phillies	0,330,998	104	109	153	565	3.693
1920	NL	Ebbets Field	Brooklyn Robins	0,808,722	104	103	155	660	4.258
1920	NL	Forbes Field	Pittsburgh Pirates	0,429,037	103	103	155	530	3.419
1920	NL	Wrigley Field	Chicago Cubs	0,480,783	101	102	154	619	4.019
1920	NL	Polo Grounds IV	New York Giants	0,929,609	100	97	155	682	4.400
1920	NL	Robison Field/Sportsman's Park IV	St. Louis Cardinals	0,326,836	98	98	155	675	4.355
1920	NL	Crosley Field	Cincinnati Reds	0,568,107	98	97	154	639	4.149
1920	NL	Braves Field	Boston Braves	0,162,483	95	97	153	523	3.418

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Year	L	park	name	Attend	BPF	PPF	G	R	RperG
1921	AL	Sportsman's Park IV	St. Louis Browns	0,355,978	106	105	154	835	5.422
1921	AL	Polo Grounds IV	New York Yankees	1,230,696	102	98	153	948	6.196
1921	AL	League Park II	Cleveland Indians	0,748,705	102	100	154	925	6.006
1921	AL	Shibe Park	Philadelphia Athletics	0,344,430	100	104	155	657	4.239
1921	AL	Navin Field	Detroit Tigers	0,661,527	99	100	154	883	5.734
1921	AL	Comiskey Park	Chicago White Sox	0,543,650	98	98	154	683	4.435
1921	AL	Fenway Park I	Boston Red Sox	0,279,273	97	99	154	668	4.338
1921	AL	Griffith Stadium I	Washington Senators	0,456,069	95	96	154	704	4.571

Ruth broke the HR record for the third consecutive year, second time with the Polo Grounds as his home park.  Yanks led in runs per game and attendance.  Polo Grounds in the NL:

Year	L	park	name	Attend	BPF	PPF	G	R	RperG
1921	NL	Baker Bowl	Philadelphia Phillies	0,273,961	107	111	154	617	4.006
1921	NL	Ebbets Field	Brooklyn Robins	0,613,245	105	104	152	667	4.388
1921	NL	Forbes Field	Pittsburgh Pirates	0,701,567	102	101	154	692	4.494
1921	NL	Polo Grounds IV	New York Giants	0,973,477	102	98	153	840	5.490
1921	NL	Wrigley Field	Chicago Cubs	0,410,107	100	101	153	668	4.366
1921	NL	Sportsman's Park IV	St. Louis Cardinals	0,384,773	97	96	154	809	5.253
1921	NL	Crosley Field	Cincinnati Reds	0,311,227	95	94	153	618	4.039
1921	NL	Braves Field	Boston Braves	0,318,627	94	96	153	721	4.712

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Year	L	park	name	Attend	BPF	PPF	G	R	RperG
1927	AL	Shibe Park	Philadelphia Athletics	0,605,529	105	102	155	841	5.426
1927	AL	Sportsman's Park IV	St. Louis Browns	0,247,879	103	105	155	724	4.671
1927	AL	Navin Field	Detroit Tigers	0,773,716	101	102	156	845	5.417
1927	AL	League Park II	Cleveland Indians	0,373,138	101	102	153	668	4.366
1927	AL	Griffith Stadium I	Washington Senators	0,528,976	99	98	157	782	4.981
1927	AL	Yankee Stadium I	New York Yankees	1,164,015	98	94	155	975	6.290
1927	AL	Comiskey Park	Chicago White Sox	0,614,423	98	98	153	662	4.327
1927	AL	Fenway Park I	Boston Red Sox	0,305,275	98	102	154	597	3.877

Yankee Stadium was sixth in BPF.  Ruth hit 28 HR there, 32 on the road.  Yanks led in runs per game and attendance.
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Year	L	park	name	Attend	BPF	PPF	G	R	RperG
1961	AL	Wrigley Field (LA)	Los Angeles Angels	0,603,510	111	112	162	744	4.593
1961	AL	Metropolitan Stadium	Minnesota Twins	1,256,723	106	106	161	707	4.391
1961	AL	Tiger Stadium	Detroit Tigers	1,600,710	103	102	163	841	5.160
1961	AL	Fenway Park II	Boston Red Sox	0,850,589	102	103	163	729	4.472
1961	AL	Municipal Stadium I	Kansas City Athletics	0,683,817	101	103	162	683	4.216
1961	AL	Comiskey Park	Chicago White Sox	1,146,019	99	97	163	765	4.693
1961	AL	Cleveland Stadium	Cleveland Indians	0,725,547	97	98	161	737	4.578
1961	AL	Memorial Stadium	Baltimore Orioles	0,951,089	96	96	163	691	4.239
1961	AL	Griffith Stadium II	Washington Senators	0,597,287	95	97	161	618	3.839
1961	AL	Yankee Stadium I	New York Yankees	1,747,725	95	93	163	827	5.074

Roger Maris set the record with his home park tied for last in BPF.  Yanks were second in runs per game but first in attendance.  Maris hit 30 HR at home, 31 on road.
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Year	L	park	name	Attend	BPF	PPF	G	R	RperG
1998	NL	Coors Field	Colorado Rockies	3,792,683	121	122	162	826	5.099
1998	NL	Wrigley Field	Chicago Cubs	2,623,194	103	103	163	831	5.098
1998	NL	Three Rivers Stadium	Pittsburgh Pirates	1,560,950	102	103	163	650	3.988
1998	NL	Veterans Stadium	Philadelphia Phillies	1,715,722	102	103	162	713	4.401
1998	NL	Cinergy Field	Cincinnati Reds	1,793,649	102	102	162	750	4.630
1998	NL	County Stadium	Milwaukee Brewers	1,811,593	100	101	162	707	4.364
1998	NL	Turner Field	Atlanta Braves	3,360,860	100	98	162	826	5.099
1998	NL	Busch Stadium II	St. Louis Cardinals	3,195,691	100	100	163	810	4.969
1998	NL	Bank One Ballpark	Arizona Diamondbacks	3,610,290	100	99	162	665	4.105
1998	NL	Shea Stadium	New York Mets	2,287,948	99	99	162	706	4.358
1998	NL	Astrodome	Houston Astros	2,458,451	98	97	162	874	5.395
1998	NL	Stade Olympique	Montreal Expos	0,914,909	98	99	162	644	3.975
1998	NL	3Com Park	San Francisco Giants	1,925,364	95	95	163	845	5.184
1998	NL	Dodger Stadium	Los Angeles Dodgers	3,089,222	95	95	162	669	4.130
1998	NL	Joe Robbie Stadium	Florida Marlins	1,730,384	94	95	162	667	4.117
1998	NL	Qualcomm Stadium	San Diego Padres	2,555,874	92	92	162	749	4.623

In 1998 Busch Stadium was about as neutral as it could be: both BPF and PPF were 100.  Mark McGwire hit 70 HR, 38 home, 32 road. Cardinals were sixth in runs per game right behind the Cubs who had Sammy Sosa with 66 HR. Cards were fourth in attendance, Cubs sixth; expansion teams Colrado and Arizona led.
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Year	L	park	name	Attend	BPF	PPF	G	R	RperG
2001	NL	Coors Field	Colorado Rockies	3,166,821	122	122	162	923	5.698
2001	NL	Bank One Ballpark	Arizona Diamondbacks	2,736,451	108	107	162	818	5.049
2001	NL	Enron Field	Houston Astros	2,904,277	107	106	162	847	5.228
2001	NL	Cinergy Field	Cincinnati Reds	1,879,757	105	105	162	735	4.537
2001	NL	Turner Field	Atlanta Braves	2,823,530	103	102	162	729	4.500
2001	NL	PNC Park	Pittsburgh Pirates	2,464,870	103	105	162	657	4.056
2001	NL	Stade Olympique	Montreal Expos	0,642,745	101	102	162	670	4.136
2001	NL	Busch Stadium II	St. Louis Cardinals	3,109,578	100	99	162	814	5.025
2001	NL	Miller Park	Milwaukee Brewers	2,811,041	98	99	162	740	4.568
2001	NL	Veterans Stadium	Philadelphia Phillies	1,782,054	98	98	162	746	4.605
2001	NL	Pro Player Stadium	Florida Marlins	1,261,226	97	97	162	742	4.580
2001	NL	Shea Stadium	New York Mets	2,658,330	96	96	162	642	3.963
2001	NL	Wrigley Field	Chicago Cubs	2,779,465	95	95	162	777	4.796
2001	NL	PacBell Park	San Francisco Giants	3,311,958	93	92	162	799	4.932
2001	NL	Dodger Stadium	Los Angeles Dodgers	3,017,143	92	91	162	758	4.679
2001	NL	Qualcomm Stadium	San Diego Padres	2,378,128	91	92	162	789	4.870

Barry Bonds broke the record with his home park in San Francisco number 14 inn BPF.  Bonds hit 73 HR: 37 at home, 36 on the road.  The Giants were fifth in runs per game but first in attendance.