Union County is in Eastern Oregon. Of the 36 counties in the Beaver State, 2,038-square-mile Union County ranks 17th by size. Union County, Oregon, includes 2,000 acres of residential land and property for sale based on recent Land Network data. The combined market value of land and rural real estate for sale here was almost $24 million. The average price of residential land for sale in Union County was $908,026. Browse all residential land and rural property for sale in Oregon to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.