Resident Population in Waldo County, ME was 40.62000 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Waldo County, ME reached a record high of 40.62000 in January of 2023 and a record low of 23.32800 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Waldo County, ME - last updated from the United States Federal Reserve on May of 2024.