Morganfield is a city in Union County, Kentucky, United States. The population was 3,494 at the 2000 census. It is the county seat of Union County. The city is named for Revolutionary War General Daniel Morgan, who received the land the city sits on in return for his military service.
Morganfield is located at 37°41′04″N 87°54′43″W / 37.684502°N 87.911893°W / 37.684502; -87.911893.
According to the United States Census Bureau, the city has a total area of 2.1 square miles (5.5 km²), of which, 2.1 square miles (5.4 km²) of it is land and 0.04 square miles (0.1 km²) of it (1.42%) is water.