Sebastian -- U.S. County in Arkansas Population (2000): 115071 Housing Units (2000): 49311 Land area (2000): 536.243464 sq. miles (1388.864138 sq. km) Water area (2000): 9.794126 sq. miles (25.366668 sq. km) Total area (2000): 546.037590 sq. miles (1414.230806 sq. km) Located within: Arkansas (AR), FIPS 05 Location: 35.293916 N, 94.351769 W Headwords: Sebastian Sebastian, AR Sebastian County Sebastian County, AR