A quick search turned up the top 3 in land area:
Sitka, Alaska 2874 square miles (took the record in 2000)
Juneau, Alaska 2717 square miles (record holder 1970 -2000)
Jacksonville, FL 758 square miles (largest in lower 48)
OKC is fairly small, at only 607 sq mi
Damn cheatin' Alaskans! Cain't never trust them suckers!