Monroe County, Michigan Monroe County, Michigan Monroe County is a county located in the U.S. state of Michigan. As of the 2010 census, the population was 152,021. The largest city and county seat is Monroe. The county was established as the second county (after Wayne County) in the Michigan Territory in 1817 and was named for then-President James Monroe. Monroe County comprises the Monroe, MI Micropolitan Statistical Area and is included in the Detroit-Warren-Ann Arbor, MI Combined Statistical Area. It is also considered a northerly extension of the Toledo Metropolitan Area. Before the county's formation, the primary settlement was Frenchtown, which was settled
Monroe County, Michigan River Raisin National Battlefield Park. Monroe County was formed from the southern portion of Wayne County in 1817. At the time, the Michigan Territory, which had not yet received statehood, consisted of only Wayne County since Detroit was the only area with a population over 1,000 people. When the area became more populated, the southern portion of Wayne County was broken off to form Monroe County with the settlement of Frenchtown was platted with the name "Monroe". The settlement also incorporated as a village in 1817 and became the county seat of Monroe County. The county and its county seat