Plymouth -- U.S. County in Massachusetts Population (2000): 472822 Housing Units (2000): 181524 Land area (2000): 660.851186 sq. miles (1711.596642 sq. km) Water area (2000): 432.535809 sq. miles (1120.262554 sq. km) Total area (2000): 1093.386995 sq. miles (2831.859196 sq. km) Located within: Massachusetts (MA), FIPS 25 Location: 41.978877 N, 70.818958 W Headwords: Plymouth Plymouth, MA Plymouth County Plymouth County, MA