To get there by train, you either have to go the scenic south coast route, or up to Clapham Junction and get a train to Yeovil Junction. Yeovil Junction station isn't even in Yeovil, it's in a small village out of town, probably like Pyecombe would be to Brighton. So once you arrive, you have to...
But we do play in Brighton.
The border (as in where Brighton & Hove City Council's area stops, and East Sussex County Council/Falmer Parish Council starts) is past the Amex, I'd guess the Drove?
The stadium is within Brighton & Hove. Just.
Sorry, but I'm not having Yeovil fans complaining about accessibility, of all clubs. Huish Park is a total nightmare to get to unless you drive, and even then, it's a crap drive.