Resident Population in Portage County, WI was 71.02400 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Portage County, WI reached a record high of 71.02400 in January of 2023 and a record low of 47.54100 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Portage County, WI - last updated from the United States Federal Reserve on May of 2024.