Allerton is a city in Wayne County, Iowa, United States. The population was 501 at the 2010 census.
Allerton is located at 40°42′26″N 93°22′2″W (40.707108, -93.367263).
According to the United States Census Bureau, the city has a total area of 1.14 square miles (2.95 km2), all land. Allerton reservoir and Bob White State Park are located approximately three miles west of Allerton.
Allerton was served by Iowa Highway 40 until it was turned over to Wayne County and made a county road. There is a network of paved farm to market roads radiating out from Allerton and connecting with the surrounding towns.
Allerton was a division point on the Chicago, Rock Island & Pacific Railroad until the bankruptcy of the line in 1980. The old Golden State Route that ran east from Allerton through Seymour, Fairfield and Chicago was then abandoned. There had been some talk of relaying the track from Allerton to Seymour on the old Rock Island right of way to provide a connection between the Canadian Pacific (old Milwaukee Road) and the Union Pacific. This idea has since been dropped due to the objections of the adjacent landowners.