Net County-to-County Migration Flow (5-year estimate) for Harmon County, OK was -40.00000 Persons in January of 2020, according to the United States Federal Reserve. Historically, Net County-to-County Migration Flow (5-year estimate) for Harmon County, OK reached a record high of 244.00000 in January of 2009 and a record low of -245.00000 in January of 2012. Trading Economics provides the current actual value, an historical data chart and related indicators for Net County-to-County Migration Flow (5-year estimate) for Harmon County, OK - last updated from the United States Federal Reserve on May of 2024.