Portage, IN -- U.S. city in Indiana Population (2000): 33496 Housing Units (2000): 13375 Land area (2000): 25.456487 sq. miles (65.931996 sq. km) Water area (2000): 1.970463 sq. miles (5.103475 sq. km) Total area (2000): 27.426950 sq. miles (71.035471 sq. km) FIPS code: 61092 Located within: Indiana (IN), FIPS 18 Location: 41.581850 N, 87.186553 W ZIP Codes (1990): 46368 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Portage, IN Portage