But these New Jersey dairy farmers have a better system. Dairy farmers can’t reduce milk supply in response, though, because cows continue to produce milk during the pandemic. Here in New Jersey, farms are the fourth-smallest in the United States, averaging 76 acres. Dave Campbell delivers milk and other grocery products for Hornstra Farms dairy on August 10, 2017, in Hingham, Massachusetts. Hornstra is among the last working dairy farms in the state.