Three's Company, Friends, Bosom Buddies, Perfect Strangers, Gilligans Island etc...

It’s basically the original roommate sitcom. Felix Unger (Tony Randall) and Oscar Madison (Jack Klugman) are two divorced men who decide to share an apartment. However beyond their martial status, the “couple” share little else — at the most basic level Felix is extremely neat while Oscar is sloppy.

http://flavorwire.com/wp-content/uploads/2010/12/odd_couple.jpg

http://flavorwire.com/134842/televisions-top-10-roommates

As much as I. like Felix and Oscar I think TV's ultimate roommates are Laverne and Shirley

That's hard to say, but they are definitely right up there. I still say that Sesame Street's Bert and Ernie were inspired by Felix and Oscar (though it would've been the movie that would've inspired them, as SS began in 1969 and TOC TV show began the following year).