Montmorency County, Michigan

Montmorency County, Michigan
Montmorency County Courthouse in Atlanta
Location within the U.S. state of Michigan
Coordinates: 45°02′N 84°08′W / 45.03°N 84.13°W / 45.03; -84.13
Country United States
State Michigan
Founded1840 (created)
1881 (organized)
Named afterHouse of Montmorency
SeatAtlanta
Largest settlementLewiston
Hillman (incorporated)
Area
 • Total
563 sq mi (1,460 km2)
 • Land547 sq mi (1,420 km2)
 • Water16 sq mi (41 km2)  2.8%
Population
 (2020)
 • Total
9,153
 • Estimate 
(2024)
9,828
 • Density18/sq mi (6.9/km2)
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional district1st
Websitemontcounty.org

Montmorency County (/ˌmɒntməˈrɛnsi/ MONT-mə-REN-see) is a county located in the U.S. state of Michigan. As of the 2020 census, the population was 9,153, making it the second-least populous county in Michigan's Lower Peninsula, behind its southern neighbor, Oscoda County. The county seat is Atlanta.

Montmorency County is part of Northern Michigan, and is part of the Lake Huron watershed. The Thunder Bay River, which drains much of the county, flows to Lake Huron's Thunder Bay at Alpena.