Alexander City, known to locals as "Alex City", is the largest city in Tallapoosa County, Alabama, United States, with a population of 14,843 as of the 2020 census. It has been the largest community in Tallapoosa County since 1910. It is known for Lake Martin with its 750 miles (1,210 km) of wooded shoreline and 44,000 acres (18,000 ha) of water. Lake Martin stands on the Tallapoosa River and offers boating, swimming, fishing, golfing, and camping. Many neighborhoods and luxury homes are located on the lake.

Tallapoosa County is located in the east-central portion of the U.S. state of Alabama. As of the 2020 census, the population was 41,311. Its county seat is Dadeville. Its largest city is Alexander City.