Dearborn, Michigan. Dearborn is a city in the State of Michigan. It is located in Wayne County and is part of the Detroit metropolitan area. Dearborn is the eighth largest city in the State of Michigan. As of the 2010 census, it had a population of 98,153. First settled in the late 18th century by French farmers in a series of ribbon farms along the Rouge River and the Sauk Trail, the community grew with the establishment of the Detroit Arsenal on the Chicago Road linking Detroit and Chicago. It later grew into a m