Answer:
Newberry-Baker, California (7988.5 sq. mi.)
Clark, Nevada (7432.1 sq. mi.)
Diamond, Oregon (6901.2 sq. mi.)
Elk City, Idaho (5967.6 sq. mi.)
Quemado, New Mexico (4953.6 sq. mi.)
Coconino, Arizona (4737.5 sq. mi.)
Death Valley, California (4713.3 sq. mi.)
High Desert, Nevada (4400.5 sq. mi.)
Duckwater, Nevada (4346.4 sq. mi.)
Imlay, Nevada (4234.3 sq. mi.)