11777 -- U.S. ZIP code Municipality (1990): PORT JEFFERSON, New York All ZIPs for this municipality (1990): 11777 Population (2000): 9025 Housing Units (2000): 3489 Land area (2000): 4.310757 sq. miles (11.164810 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 4.310757 sq. miles (11.164810 sq. km) Located within: New York (NY) Location: 40.946103 N, 73.062224 W