Locations With headquarters based in McKinney, Texas, IES has three locations with full-time staff. IES McKinney301 W Eldorado Parkway, Ste. 101McKinney, Texas 75069 [view map] IES Denton101 South Locust Street Ste. B-03Denton, Texas 76201 [view map] IES Waco1612 Columbus Avenue, Ste. CWaco, TX 76701
