4. Oklahoma City
AP Photo/The Oklahoman/KWTV9, Bill Waugh
Government--be it federal, state, or local--is far and away the largest jobs provider in Oklahoma City, with 38,000 people employed by the state of Oklahoma, an additional 8,706 employed by the U.S. Postal Service, and 4,320 working for the city itself, according to the Greater Oklahoma City Chamber of Commerce. Telecommunications companies also do major business in the Oklahoma capital: AT&T, cellular provider Dobson Communications, and cable, Internet, and telephone company Cox Communications are three of the city’s top 20 employers.