Dewey -- U.S. County in Oklahoma Population (2000): 4743 Housing Units (2000): 2425 Land area (2000): 1000.133103 sq. miles (2590.332736 sq. km) Water area (2000): 8.130125 sq. miles (21.056927 sq. km) Total area (2000): 1008.263228 sq. miles (2611.389663 sq. km) Located within: Oklahoma (OK), FIPS 40 Location: 36.003983 N, 99.031550 W Headwords: Dewey Dewey, OK Dewey County Dewey County, OK