A farmer is one who cultivates land and reaps its organic products, usually for sustenance.
The Widin Dairy Farm delivered milk in New York City in the 1930s. (TOS: "The City on the Edge of Forever")
Jack Hayes was an farmer from Ohio in 1937. His farm truck was a 1936 Ford truck. He grew alfalfa and had cattle. (VOY: "The 37's")
Moore was a corn farmer from Broken Bow, Oklahoma, in 2151. (ENT: "Broken Bow")
James T. Kirk's uncle owned a farm in Idaho on which he kept horses. Kirk revisited this farm when he first entered the Nexus. (Star Trek Generations)
Mullibok was a Bajoran farmer who lived on the Bajoran moon Jeraddo. (DS9: "Progress")
Shakaar Edon was a farmer and later First Minister of Bajor. (DS9: "Shakaar")