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County · code 26059

Hillsdale CountyMichigan

Hillsdale County is in Michigan and has its seat in Hillsdale. The county was created by Michigan Territory on October 29, 1829.

  • Founded1829
  • County seatHillsdale
  • Land area598 sq mi + 8.9 sq mi water
  • Population45,746 2020 Census
  • Parcels mapped33,531 checked 15 October 2026
Open the free map Click any parcel in Hillsdale County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

Williams, OHJacksonBranch Hillsdale Census outline · seat marked

Where it is

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

History

Formed in 1829 from Lenawee County

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

When Hillsdale County was created, it included part of a disputed strip west of Lake Erie that was claimed by Ohio but controlled by Michigan. It was first attached to Lenawee County for administrative purposes, then fully organized and detached in 1835. In 1837, when Michigan became a state, Hillsdale County lost territory to Ohio as the boundary dispute was settled in Ohio's favor.

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

  1. 1829
    Hillsdale County created Hillsdale created by Michigan Territory from Non-County Area 4 and Non-County Area 1 attached to Lenawee; included part of the disputed strip west of Lake Erie that was also claimed by Ohio but controlled by Michigan; Hillsdale not fully organized, not attached.
    from Lenawee
    · Mich. Terr. Laws, 2:sec. 9/p. 736
  2. 1829
    Changed Hillsdale attached to Lenawee for administrative and judicial purposes.
    Lenawee
    · Mich. Terr. Laws, 2:744-746
  3. 1835
    Changed Hillsdale fully organized, detached from Lenawee.
    Lenawee
    · Mich. Terr. Laws, 3:1362
  4. 1837
    Lost territory Hillsdale 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 Hillsdale

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

Hillsdale by the Census

Population
45,746 2020 Census count
Housing units
21,396 2020 Census count
Land area
598 square miles
Water area
8.9 square miles
People per sq mi
76 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.

Zoning and code

County government

See your own lot on these maps

Open Hillsdale 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 Hillsdale County

When was Hillsdale County founded?
Hillsdale County was founded in 1829, formed from Lenawee County.
What is the county seat of Hillsdale County?
The county seat of Hillsdale County is Hillsdale.
Is there an online parcel map for Hillsdale County?
Yes. A public source publishes a parcel map of 33,531 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Hillsdale County's boundary or name changed?
Hillsdale County was created in 1829 from Lenawee County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Lenawee County.
Is my lot in a flood zone?
We do not have flood maps for Hillsdale 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