http://www.avclub.com/articles/where-are-all-the-bluecollar-sitcoms,85978/

The working class used to be the center of many comedies. Now, it’s all but gone.

Raising Hope and The Middle are too examples of lower middle class, working families. Burt has a one man lawn business, his wife is a maid, and his son (the lead character) works in a dead end job in a supermarket.

The Middle, Mike Heck works in a quarry, while Frankie is between jobs, and is nearly 50 and going to trade school to work in a dentist office. They share one car, with their son's Axel's car a piece of crap.

Mike and Molly (from Mike & Molly) are not wealthy either, having to move into the basement of Molly's mother's home to save money for a child and a down payment on a home. He's a cop in Chicago and she is a school teacher. Then there is five people living in a two bedroom house with a basement apartment with everyone sharing in the clothes washing. (This show is a favorite of mine.)

Sheldon and Leonard on The Big Bang Theory live together to save on rent and bills, with their neighbor a waitress at The Cheesecake Factory. Even though the actors playing Sheldon and Leonard are about 40.

Then there is a show called....Two Broke Girls! Seen it twice, hated it (with the exception of having Garrett Morris in the cast.) Basically these are two chicks working as waitresses in a dive diner in New York City, one of the most expensive cities in the World.