The most recent census data for Allenton City, MI was taken on May 2, 2013. The population was 1,879 people, a percentage of which is below the national average. The median age was 34 years, and nearly one-fourth of the residents were under 18 years of age. The median household size was 2.42 people, and there were 91.8 male residents for every 100 female residents. The percentage of the population below the federal poverty line was 18.5%.
The city has a total area of 18.0 square miles (46.6 square km). The Jordan Creek, which originates from the Lehigh River, empties into the creek. Other bodies of water include Lake Muhlenberg and a pond in Trexler Park. The median household income in Allenton City is lower than the state average. While it is home to more than one Medal of Honor recipient, the area has a significantly higher percentage of incarcerated individuals and homeless people.