In my state of Texas and only counting commercial airports I had at least taken off or landed at (as I've flown into plenty of smaller municipal airports unfamiliar to most anyways):
DFW and Dallas Love Field
Houston (both Intercontinental and Hobby)
Austin Bergstrom
San Antonio
El Paso
Harlingen
In the states (from West to East):
Seattle-Tacoma
LAX
Oakland
Las Vegas
(Shortly adding San Diego)
Phoenix (was just a diversion but that counts I suppose)
Salt Lake City
Denver
Durango, CO
OKC
O'Hare
Lexington
Columbus
Pittsburgh
Newark
Albany
International:
Monterrey, Mex
Mexico City
Cancun
Merida, Mex
Frankfurt
Vienna
Copenhagen
Rome