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County · code 26069

Iosco CountyMichigan

Iosco County is in Michigan and has its seat in Tawas City. The county was created in 1840 from parts of Saginaw, Michilimackinac, and Mackinac counties.

  • Founded1840
  • County seatTawas City
  • Land area549 sq mi + 1,341 sq mi water
  • Population25,237 2020 Census
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Updated

AlconaHuronArenacOgemawOscoda Tawas City Census outline · seat marked

Where it is

Iosco 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 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 CountyOntonagon CountyOsceola CountyOscoda CountyOtsego CountyOttawa CountyPresque Isle CountyRoscommon CountySaginaw CountySt. Clair CountySt. Joseph CountySanilac CountySchoolcraft CountyShiawassee CountyTuscola CountyVan Buren CountyWashtenaw CountyWayne CountyWexford CountyIosco County Iosco
Counties of Michigan · Iosco highlighted

History

Formed in 1840 from Saginaw County, Michilimackinac County and Mackinac County

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

Originally named Kanotin when created in 1840, the county was renamed Iosco in 1843. Iosco was fully organized and detached from Saginaw in 1857, and gained jurisdiction over portions of Lake Huron and Saginaw Bay. The county absorbed Ogemaw County in 1867, and Alcona and Oscoda were detached in 1869.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries; the 5 that matter most are shown first.

  1. 1840
    Iosco County created Kanotin (now Iosco) created from Non-County Area 2 attached to Saginaw; Kanotin not fully organized, attached to Michilimackinac (now Mackinac) "for judicial purposes."
    from Saginawfrom Michilimackinacfrom Mackinac
    · Mich. Acts 1840, ann. sess., no. 119, secs. 14, 35/pp. 197, 200
  2. 1843
    Renamed Kanotin renamed Iosco.
    formerly Kanotin
    · Mich. Acts 1843, ann. sess., no. 67/p. 145
  3. 1853
    Changed Iosco detached from Mackinac, attached to Cheboygan "for judicial and municipal purposes."
    MackinacCheboygan
    · Mich. Acts 1853, reg. sess., no. 20/p. 19
  4. 1867
    Gained territory Iosco gained all of Ogemaw; Ogemaw eliminated.
    from Ogemaw
    · Mich. Acts 1867, reg. sess., no. 301/p. 222
  5. 1873
    Lost territory Iosco lost to re-creation of Ogemaw; Ogemaw not fully organized, attached to Iosco "for judicial and municipal purposes."
    to Ogemaw
    · Mich. Acts 1873, reg. sess., no. 338/p. 85
Show all 14 changes (9 more)
  1. 1840
    Iosco County created Kanotin (now Iosco) created from Non-County Area 2 attached to Saginaw; Kanotin not fully organized, attached to Michilimackinac (now Mackinac) "for judicial purposes."
    from Saginawfrom Michilimackinacfrom Mackinac
    · Mich. Acts 1840, ann. sess., no. 119, secs. 14, 35/pp. 197, 200
  2. 1843
    Renamed Kanotin renamed Iosco.
    formerly Kanotin
    · Mich. Acts 1843, ann. sess., no. 67/p. 145
  3. 1853
    Changed Iosco detached from Mackinac, attached to Cheboygan "for judicial and municipal purposes."
    MackinacCheboygan
    · Mich. Acts 1853, reg. sess., no. 20/p. 19
  4. 1853
    Changed Iosco detached from Cheboygan, attached to Saginaw "for judicial and representative purposes."
    CheboyganSaginaw
    · Mich. Acts 1853, reg. sess., no. 35/p. 44
  5. 1857
    Changed Iosco fully organized, detached from Saginaw. Iosco assigned jurisdiction over Lake Huron and Saginaw Bay concurrent with "the other counties contiguous thereto."
    Saginaw
    · Mich. Acts 1857, reg. sess., no. 130/p. 358
  6. 1857
    Changed Iosco was authorized to be attached to Bay, but Iosco had been fully organized on 16 February 1857.
    Bay
    · Mich. Acts 1857, reg. sess., no. 171, secs. 1-2, 15/pp. 438-439, 441; Mich. Rpts., 5:114
  7. 1858
    Changed Alcona and Oscoda detached from Alpena, attached to Iosco; Crawford and Ogemaw detached from Cheboygan, attached to Iosco. All attachments were "for judicial and municipal purposes."
    AlconaOscodaAlpenaCrawfordOgemawCheboygan
    · Mich. Acts 1858, ext. sess., no. 5, sec. 1/p. 15
  8. 1859
    Changed Mistake of 20 April 1857, attaching Iosco to Bay, was corrected (no change).
    Bay
    · Mich. Acts 1859, reg. sess., no. 97/p. 255
  9. 1861
    Changed Attachment of Ogemaw to Iosco was confirmed (no change).
    Ogemaw
    · Mich. Acts 1861, reg. sess., no. 87/p. 121
  10. 1863
    Changed Crawford detached from Iosco, attached to Antrim "for municipal and judicial purposes."
    CrawfordAntrim
    · Mich. Acts 1863, reg. sess., no. 78/p. 119
  11. 1867
    Gained territory Iosco gained all of Ogemaw; Ogemaw eliminated.
    from Ogemaw
    · Mich. Acts 1867, reg. sess., no. 301/p. 222
  12. 1869
    Changed Alcona fully organized, detached from Iosco; Oscoda detached from Iosco, attached to Alcona "for judicial and other purposes."
    AlconaOscoda
    · Mich. Acts 1869, reg. sess., no. 266, secs. 1, 5/pp. 336-337
  13. 1873
    Lost territory Iosco lost to re-creation of Ogemaw; Ogemaw not fully organized, attached to Iosco "for judicial and municipal purposes."
    to Ogemaw
    · Mich. Acts 1873, reg. sess., no. 338/p. 85
  14. 1875
    Changed Ogemaw fully organized, detached from Iosco.
    Ogemaw
    · Mich. Acts 1875, reg. sess., pub., no. 132/p. 159

Land and parcels

What the maps cover in Iosco

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

Iosco by the Census

Population
25,237 2020 Census count
Housing units
19,856 2020 Census count
Land area
549 square miles
Water area
1,341 square miles · 71% of the county, including large bodies of water
People per sq mi
46 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

Iosco 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 Iosco County

When was Iosco County founded?
Iosco County was founded in 1840, formed from Saginaw County, Michilimackinac County and Mackinac County.
What is the county seat of Iosco County?
The county seat of Iosco County is Tawas City.
Is there an online parcel map for Iosco 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 Iosco County's boundary or name changed?
Iosco County was created in 1840 from Saginaw County, Michilimackinac County and Mackinac County. Since then the Atlas of Historical County Boundaries records 11 later changes, chiefly involving Ogemaw County, Cheboygan County and Alcona County. It was formerly called Kanotin.
Is my lot in a flood zone?
We do not have flood maps for Iosco 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