Cory & Topanga moved to NYC.
Minkus runs Minkus International. Based on the fact that Farkle lives with his mom & Minkus is still very much into Topanga, I'd assume Minkus & Farkle's mom aren't together. Minkus flew into NYC in his helicopter just to attend Career Day - and even if he does live in NYC, he runs Minkus International, a wealthy and big company.
as for Harley, Cory got him hired as a janitor..in the same school he teaches..in New York.