what county is delta utah in
Sponsored Topics. Delta is a city in Millard County, Utah, United States. The population was 3,209 at the 2000 census. Delta is located at 39Â°21â²11â³N 112Â°34â²25â³W / 39.353145Â°N 112.573656Â°W / 39.353145; -112.573656 (39.353145, -112.573656). According to the United States Census Bureau, the city has a total area of 3.2 square miles (8.2 km2), all of it land.