Washington County is in Green Country Oklahoma. Of the 77 counties in the state, Washington County is 77th in terms of its size (424 square miles). A recent survey of Land Network data shows approximately 1,000 acres of farms for sale in Oklahoma's Washington County, which is valued at a combined $7 million. The average price of farms for sale in Washington County was $557,961. Farms for sale in Washington County feature livestock including cattle, horses, goats, sheep and pig. Browse all Oklahoma farms for sale on the Land Network to find the farm, cattle operation, hobby farm or other farm property that's right for your future commercial or individual needs.