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County · code 26027

Cass CountyMichigan

Cass County is a county in Michigan with its seat in Cassopolis. It was created on October 29, 1829, and named after Lewis Cass.

  • Founded1829
  • County seatCassopolis
  • Named forLewis Cass
  • Land area490 sq mi + 18 sq mi water
  • Population51,589 2020 Census
  • Parcels mapped36,103 checked 16 October 2026
Open the free map Click any parcel in Cass County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

St. JosephVan BurenBerrien Cassopolis Census outline · seat marked

Where it is

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

Cass County was created by Michigan Territory from Lenawee County on October 29, 1829, initially not fully organized and attached to Lenawee. Four days later, on November 4, 1829, Cass was fully organized and Berrien and Van Buren counties were attached to it for administrative and judicial purposes. In 1831, Cass lost territory to the creation of Allegan and Ottawa counties and a small area to St. Joseph County. Berrien detached in 1831 and Van Buren detached in 1837, after each was fully organized.

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

  1. 1829
    Cass County created Cass created by Michigan Territory from Non-County Area 1 attached to Lenawee; Cass not fully organized, not attached.
    from Lenawee
    · Mich. Terr. Laws, 2:sec. 12/p. 737
  2. 1829
    Changed Cass fully organized. Berrien and Van Buren attached to Cass; part of Non-County Area 1 detached from Lenawee, attached to Cass. All attachments were for administrative and judicial purposes.
    BerrienVan BurenLenawee
    · Mich. Terr. Laws, 2:744-746
  3. 1831
    Lost territory Cass lost all of attached Non-County Area 1 to creation of Allegan and Ottawa; Non-County Area 1 eliminated.
    to Alleganto Ottawa
    · Mich. Terr. Laws, 3:secs. 4-5/p. 871
  4. 1831
    Lost territory Cass lost small area to St. Joseph.
    to St. Joseph
    · Mich. Terr. Laws, 3:889
  5. 1831
    Changed Berrien fully organized, detached from Cass.
    Berrien
    · Mich. Terr. Laws, 3:902-903
  6. 1837
    Changed Van Buren fully organized, detached from Cass.
    Van Buren
    · Mich. Acts 1837, ann. sess., no. 51/p. 97

Land and parcels

What the maps cover in Cass

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

Cass by the Census

Population
51,589 2020 Census count
Housing units
25,291 2020 Census count
Land area
490 square miles
Water area
18 square miles
People per sq mi
105 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

GIS and maps

County government

See your own lot on these maps

Open Cass 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 Cass County

When was Cass County founded?
Cass County was founded in 1829, formed from Lenawee County, and named after Lewis Cass.
What is the county seat of Cass County?
The county seat of Cass County is Cassopolis.
Is there an online parcel map for Cass County?
Yes. Cass County publishes a parcel map of 36,103 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Cass County's boundary or name changed?
Cass County was created in 1829 from Lenawee County. Since then the Atlas of Historical County Boundaries records 5 later changes, chiefly involving Berrien County, Van Buren County and Allegan County.
Who issues building permits in Cass County?
The county's page on building permits: Building, Mechanical & Electrical Permit. Inside a city or town, ask that city first.
Is my lot in a flood zone?
We do not have flood maps for Cass 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