Land for sale in Winnebago County, Iowa, recently totaled nearly $7 million and almost 1,000 acres. Winnebago County ranks 79th out of 99 counties in the Wrestling State for the combined amount of land currently advertised for sale. Of all farms, ranches, and rural real estate for sale in Winnebago County, Lake Mills featured the most land for sale. Winnebago County is Iowa's 98th biggest county (401 square miles). It's located in the Central Iowa region of the state.