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County · code 26131

Ontonagon CountyMichigan

Ontonagon County is in Michigan and has its county seat in Ontonagon. The county was formed on March 9, 1843.

  • Founded1843
  • County seatOntonagon
  • Named forOntonagon River, Michigan
  • Land area1,311 sq mi + 2,429 sq mi water
  • Population5,816 2020 Census
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Updated

GogebicHoughtonAshland, WICook, MNKeweenaw Ontonagon Census outline · seat marked

Where it is

Ontonagon 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 CountyMonroe CountyMontcalm CountyMontmorency CountyMuskegon CountyNewaygo CountyOakland CountyOceana CountyOgemaw CountyOsceola CountyOscoda CountyOtsego CountyOttawa CountyPresque Isle CountyRoscommon CountySaginaw CountySt. Clair CountySt. Joseph CountySanilac CountySchoolcraft CountyShiawassee CountyTuscola CountyVan Buren CountyWashtenaw CountyWayne CountyWexford CountyOntonagon County Ontonagon
Counties of Michigan · Ontonagon highlighted

History

Formed in 1843 from Chippewa County, Michilimackinac County and Mackinac County

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

Ontonagon County was created from Chippewa, Michilimackinac (now Mackinac), and Non-County Area 6, but was not fully organized and was attached to Chippewa for judicial purposes. In 1845, the county lost Isle Royale to the creation of Houghton County, and in 1846 it was detached from Chippewa and attached to Houghton for judicial and other purposes. Ontonagon County became fully organized and independent in 1853 after gaining territory from Houghton County. The county later lost land to Houghton in 1861 and to the creation of Gogebic County in 1887.

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

  1. 1843
    Ontonagon County created Ontonagon created from Chippewa, Michilimackinac (now Mackinac), and Non-County Area 6; Ontonagon not fully organized, attached to Chippewa "for judicial purposes."
    from Chippewafrom Michilimackinacfrom Mackinac
    · Mich. Acts 1843, ann. sess., no. 89, secs. 5, 7/pp. 202-203
  2. 1845
    Lost territory Ontonagon lost Isle Royale to creation of Houghton.
    to Houghton
    · Mich. Acts 1845, ann. sess., no. 48/p. 58
  3. 1846
    Changed Ontonagon detached from Chippewa, attached to Houghton "for judicial and other purposes."
    ChippewaHoughton
    · Mich. Acts 1846, ann. sess., no. 157, secs. 1, 7/pp. 286-287
  4. 1848
    Boundary clarified Ontonagon boundaries were redefined (no change).
    no change
    · Mich. Acts 1848, ann. sess., no. 229, secs. 1-4, 10/pp. 345-347
  5. 1853
    Gained territory Ontonagon gained from Houghton; Ontonagon fully organized, detached from Houghton.
    from Houghton
    · Mich. Acts 1853, reg. sess., no. 3/p. 3
  6. 1861
    Lost territory Ontonagon lost to Houghton.
    to Houghton
    · Mich. Acts 1861, reg. sess., no. 128/p. 173
  7. 1887
    Lost territory Ontonagon lost to creation of Gogebic.
    to Gogebic
    · Mich. Acts 1887, reg. sess., loc., no. 337, secs. 1, 14/pp. 23, 25

Land and parcels

What the maps cover in Ontonagon

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

Ontonagon by the Census

Population
5,816 2020 Census count
Housing units
5,244 2020 Census count
Land area
1,311 square miles
Water area
2,429 square miles · 65% of the county, including large bodies of water
People per sq mi
4 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

Ontonagon County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

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Questions

Common questions about Ontonagon County

When was Ontonagon County founded?
Ontonagon County was founded in 1843, formed from Chippewa County, Michilimackinac County and Mackinac County, and named after Ontonagon River, Michigan.
What is the county seat of Ontonagon County?
The county seat of Ontonagon County is Ontonagon.
Is there an online parcel map for Ontonagon County?
Not that we have found yet. Lot lines and owners of record are kept by the county assessor's office. When a public parcel map appears, it shows here.
Has Ontonagon County's boundary or name changed?
Ontonagon County was created in 1843 from Chippewa County, Michilimackinac County and Mackinac County. Since then the Atlas of Historical County Boundaries records 5 later changes, chiefly involving Houghton County, Chippewa County and Gogebic County.
Is my lot in a flood zone?
We do not have flood maps for Ontonagon 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