01564 -- U.S. ZIP code Municipality (1990): STERLING, Massachusetts All ZIPs for this municipality (1990): 01564 Population (2000): 7257 Housing Units (2000): 2637 Land area (2000): 30.638776 sq. miles (79.354063 sq. km) Water area (2000): 0.703072 sq. miles (1.820948 sq. km) Total area (2000): 31.341848 sq. miles (81.175011 sq. km) Located within: Massachusetts (MA) Location: 42.436875 N, 71.773331 W