Land for sale in Pitkin County recently totaled around $3 billion and approximately 100,000 acres. Pitkin County ranks 17th in the Rocky Mountain State for the combined amount of land currently advertised for sale. Of all locations in Pitkin County with land and rural real estate for sale, Aspen featured the most land for sale. Based on its natural assets, Pitkin County's economy is dependent on tourism and recreation. Pitkin County is the 44th largest county (973 square miles) in Colorado. It's located in the South Central Colorado region of the state.