I have seen Accies play home games at -

Douglas Park
Firhill
Cliftonhill
Firk Park
Broadwood
New Dougals Park

We have had 6 home grounds in the last 20 yeras.

Were Fir Park and Broadwood not just one offs, therefore stretching the 'home grounds' tag a wee bit for those two? (Genuine question BTW. I don't recall you being based at either so I am assuming they were used for cup ties).
Nevertheless. I doubt if any club will be able to beat 4 grounds that were 'home' for a full season.

If you're talking "one off" home games, we've played home league matches at Tynecastle, Meadowbank, (Old) Bayview, Ochilview and Recreation Park (when locked out of our own ground), as well as cup games "switched" elsewhere.

We've only ever had the one home ground in our entire history so far as I'm aware. It is possible that might change next season depending on whether we end up being able to use Palmerston for the impending UEFA Cup tie or not.

You'll obviously be a lot more clued up than me but I'm sure I read (or heard) somewhere last week that Palmerston was OK, with the terracing out the game.

Read that as well but from a financial point of view if they get a decent draw they have not got that many seats, so a move would be the best option

Since Caley Thistle were formed in 1994 we have played home games at:

Telford Street (1994-1996)
Tannadice (Rangers Scottish cup quarter final 1996)
Caledonian Stadium (1996-present)
Pittodrie (2004-2005)
Victoria Park (home cup tie v St Johnstone)