Resident Population in Grant County, OR was 7.21500 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Grant County, OR reached a record high of 8.33000 in January of 1986 and a record low of 6.81700 in January of 2009. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Grant County, OR - last updated from the United States Federal Reserve on May of 2024.