William Grove Speedway does a very nice job with keeping track of their history.

http://www.williamsgrove.com/winners.htm

They have winner list for just about every division that has race on the track.

How many tracks keep stats like these:

Raced in Both the Indianapolis 500 and at Williams Grove Speedway

Indy Winners: (Indy wins in parentheses)

-George Robson ('46)
-Bill Holland ('49)
-Johnnie Parsons ('50)
-Lee Wallard ('51)
-Troy Ruttman ('52)
-Bill Vukovich ('53, '54)
-Bob Sweikert ('55)
-Pat Flaherty ('56)
-Sam Hanks ('57)
-Jimmy Bryan ('58)
-Roger Ward ('59, '62)
-AJ Foyt ('61, '64, '67, '77)
-Parnelli Jones ('63)
-Mario Andretti ('69)
-Gordon Johncock ('73, '82)
-Johnny Rutherford ('74, '76, '80)

Tracks like Hagerstown, Lincoln and Port Royal all keep track of winners and track records on their web site.