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County · code 26115

Monroe CountyMichigan

Monroe County is a county in Michigan, on the border with Ohio, founded in 1817, with its seat at Monroe.

  • Founded1817
  • County seatMonroe
  • Named forJames Monroe
  • Land area549 sq mi + 131 sq mi water
  • Population154,809 2020 Census
  • Parcels mapped69,929 checked 15 October 2026
Open the free map Click any parcel in Monroe County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

Lucas, OHWayneWashtenawLenawee Monroe Census outline · seat marked

Where it is

Monroe on the map of Michigan

Michigan has 83 counties and county equivalents, each with its own records office. Shapes with a page are links.

Alcona CountyAlger CountyAllegan CountyAlpena CountyAntrim CountyArenac CountyBaraga CountyBarry CountyBay CountyBenzie CountyBerrien CountyBranch CountyCalhoun CountyCass CountyCharlevoix CountyCheboygan CountyChippewa CountyClare CountyClinton CountyCrawford CountyDelta CountyDickinson CountyEaton CountyEmmet CountyGenesee CountyGladwin CountyGogebic CountyGrand Traverse CountyGratiot CountyHillsdale CountyHoughton CountyHuron CountyIngham CountyIonia CountyIosco CountyIron CountyIsabella CountyJackson CountyKalamazoo CountyKalkaska CountyKent CountyKeweenaw CountyLake CountyLapeer CountyLeelanau CountyLenawee CountyLivingston CountyLuce CountyMackinac CountyMacomb CountyManistee CountyMarquette CountyMason CountyMecosta CountyMenominee CountyMidland CountyMissaukee CountyMontcalm CountyMontmorency CountyMuskegon CountyNewaygo CountyOakland CountyOceana CountyOgemaw CountyOntonagon CountyOsceola CountyOscoda CountyOtsego CountyOttawa CountyPresque Isle CountyRoscommon CountySaginaw CountySt. Clair CountySt. Joseph CountySanilac CountySchoolcraft CountyShiawassee CountyTuscola CountyVan Buren CountyWashtenaw CountyWayne CountyWexford CountyMonroe County Monroe
Counties of Michigan · Monroe highlighted

History

Formed in 1817 from Wayne County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Monroe County was created on July 14, 1817, by Michigan Territory from Wayne County and included part of a disputed strip west of Lake Erie. In 1822, Monroe County lost territory to the creation of Lenawee County and Washtenaw County, and lost additional land to Wayne County. When Michigan became a state in 1837, Monroe County lost territory to Ohio as the boundary dispute over the strip running from Indiana to Lake Erie was settled in favor of Ohio.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1817
    Monroe County created Monroe created by Michigan Territory from Wayne; included part of the disputed strip west of Lake Erie that also was claimed by Ohio but controlled by Michigan (District boundaries remained unchanged).
    from Wayne
    · Terr. Papers U.S., 10:729
  2. 1822
    Lost territory Monroe lost to Wayne and to the creation of Lenawee and Washtenaw. Lenawee not fully organized, attached to Monroe; Non-County Area 1 attached to Monroe. All attachments were for administrative and judicial purposes.
    to Wayneto Lenaweeto Washtenaw
    · Terr. Papers U.S., 11:308-313
  3. 1826
    Changed Lenawee fully organized, detached from Monroe; Non-County Area 1 detached from Monroe, attached to Lenawee for administrative and judicial purposes.
    Lenawee
    · Mich. Terr. Laws, 2:292
  4. 1837
    Lost territory Monroe lost to Ohio when the state of Michigan was created from Michigan Territory. Boundary dispute with Ohio over the strip running from Indiana to Lake Erie was settled in favor of Ohio. · U.S. Stat., vol. 5, ch. 99 [1836], secs. 1-2/p. 49 and ch. 6 [1837]/p. 144; Van Zandt, 127

Land and parcels

What the maps cover in Monroe

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Monroe by the Census

Population
154,809 2020 Census count
Housing units
65,845 2020 Census count
Land area
549 square miles
Water area
131 square miles
People per sq mi
282 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Who to ask before you build, dig or sell

Official county pages only. We link to them; we do not copy them, because they change.

Inside a city or town, permits usually come from that city rather than the county.

Records

Permits

Zoning and code

County government

See your own lot on these maps

Open Monroe County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about Monroe County

When was Monroe County founded?
Monroe County was founded in 1817, formed from Wayne County, and named after James Monroe.
What is the county seat of Monroe County?
The county seat of Monroe County is Monroe.
Is there an online parcel map for Monroe County?
Yes. Monroe County publishes a parcel map of 69,929 parcels, rated official here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Monroe County's boundary or name changed?
Monroe County was created in 1817 from Wayne County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Lenawee County, Washtenaw County and Wayne County.
Who issues septic and well permits in Monroe County?
The county's page on septic systems and wells: Health Education Team.
Is my lot in a flood zone?
We do not have flood maps for Monroe County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door