The town of Union Grove is located in the U.S. state of Alabama. It is part of the Huntsville-Decatur Combined Statistical Area. Union Grove lies in Marshall County around 3 miles from Guntersville Lake and 6 miles from Arab. The total land area is 0.6 square miles at 34°24′0″N 86°26′46″W. Union Grove is elevated by 1,027 feet above sea level. Marshall County School System provides public education in Union Grove. The Arab Electric Cooperative is the one supplying electricity throughout the town. As of the 2010 census, Union Grove had a total population of 77 individuals with the population density of 142.09/sq mi. Zip code is 35175.