About Decatur, MIDecatur is located in Michigan. Decatur, Michigan has a population of 1,802. Decatur is more family-centric than the surrounding county with 31% households with children. The county percentage for households with children is 29%. The median household income in Decatur, Michigan is $36,467. The median household income for the surrounding county is $53,240 compared to the national median of $61,963. The median age of people living in Decatur is 38.2 years. Decatur WeatherThe average high temperature in July is 83.29 degrees, with an average low temperature in January of 14.51 degrees. The annual precipitation is 38.57. Decatur MapDecatur real estate officesReal estate near DecaturNearby CitiesNearby Cities Homes for Sale |