I've seen us at 40 current SPFL grounds plus Muirton, Kilbowie, Firs Park, Love St, Shielfield, Annfield, Central Park, Glebe Park, Ainslie Park, King George V Leven, Inverurie Locos, Huntly, Selkirk, Galashiels, Boghead, Broomfield, Douglas Park, Shawfield, Banks O' Dee, Kirriemuir, Lochee United, Dundee North End, Forres Mechanics, Telford Street, Dalgety Bay, Cliftonhill and Brora Rangers, St Andrews University. I might have forgotten some.
Dalymount Park presumably doesn't count as the game never kicked off.