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
Oak Hill (James Monroe house) to sell that property to pay debts he had incurred while serving as President. Monroe had put Oak Hill on the market in 1809, and placed an advertisement in "The Washingtonian" on December 23 of that year: He also attempted to sell the land in 1825, but failed to receive an acceptable bid both times. In 1822, Monroe began construction on the main house, a two-story brick mansion in the Federal style. He hired James Hoban, the designer of the White House, to serve as architect. Monroe's longtime friend and political mentor Thomas Jefferson offered many design suggestions. Monroe and