Located less than a quarter of a mile from the 80/94 & Crisman Rd Interchange. Portage city in Portage Township, Porter County, IN. The population was 36,828 as of the 2010 census and it is the largest city in Porter County and third largest in Northwest Indiana. Portage offer a wide variety of park services, from sports leagues, to crafts, to hiking and water sports. The Sammie L. Maletta Public Marina offers boat launch and slips for public use. The marina opens to the Burns Waterway and has access to nearby Lake Michigan.