Of 10 counties in the state, Hillsborough County is fifth in terms of its size (892 square miles). Hillsborough County is in South New Hampshire. The total value of roughly 1,000 acres of farms recently listed for sale in Hillsborough County, New Hampshire, was roughly $900,000. Browse all Hillsborough County 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 lifestyle needs. The most common type of land for sale by combined acreage in Hillsborough County is residential property.