Richland -- U.S. Parish in Louisiana Population (2000): 20981 Housing Units (2000): 8335 Land area (2000): 558.454583 sq. miles (1446.390668 sq. km) Water area (2000): 6.051121 sq. miles (15.672330 sq. km) Total area (2000): 564.505704 sq. miles (1462.062998 sq. km) Located within: Louisiana (LA), FIPS 22 Location: 32.433901 N, 91.725645 W Headwords: Richland Richland, LA Richland Parish Richland Parish, LA