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County · code 31025

Cass CountyNebraska

Cass County is a county in Nebraska with its seat at Plattsmouth. The county was created on November 23, 1854, and named after Lewis Cass.

  • Founded1854
  • County seatPlattsmouth
  • Named forLewis Cass
  • Land area557 sq mi + 8.5 sq mi water
  • Population26,598 2020 Census
  • Parcels mapped20,474 checked 15 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

SarpyOtoeMills, IAFremont, IASaunders Plattsmouth Census outline · seat marked

Where it is

Cass on the map of Nebraska

Nebraska has 93 counties and county equivalents, each with its own records office. Shapes with a page are links.

Adams CountyAntelope CountyArthur CountyBanner CountyBlaine CountyBoone CountyBox Butte CountyBoyd CountyBrown CountyBuffalo CountyBurt CountyButler CountyCedar CountyChase CountyCherry CountyCheyenne CountyClay CountyColfax CountyCuming CountyCuster CountyDakota CountyDawes CountyDawson CountyDeuel CountyDixon CountyDodge CountyDouglas CountyDundy CountyFillmore CountyFranklin CountyFrontier CountyFurnas CountyGage CountyGarden CountyGarfield CountyGosper CountyGrant CountyGreeley CountyHall CountyHamilton CountyHarlan CountyHayes CountyHitchcock CountyHolt CountyHooker CountyHoward CountyJefferson CountyJohnson CountyKearney CountyKeith CountyKeya Paha CountyKimball CountyKnox CountyLancaster CountyLincoln CountyLogan CountyLoup CountyMcPherson CountyMadison CountyMerrick CountyMorrill CountyNance CountyNemaha CountyNuckolls CountyOtoe CountyPawnee CountyPerkins CountyPhelps CountyPierce CountyPlatte CountyPolk CountyRed Willow CountyRichardson CountyRock CountySaline CountySarpy CountySaunders CountyScotts Bluff CountySeward CountySheridan CountySherman CountySioux CountyStanton CountyThayer CountyThomas CountyThurston CountyValley CountyWashington CountyWayne CountyWebster CountyWheeler CountyYork CountyCass County Cass
Counties of Nebraska · Cass highlighted

History

Founded in 1854

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

Cass County was created by proclamation of the acting governor of Nebraska Territory from non-county area on November 23, 1854. In March 1855, Cass lost land to the creation of Greene (now Seward), Lancaster, Otoe, and York counties. Between 1865 and 1867, Saunders County was briefly attached to Cass for judicial, election and revenue purposes, then detached.

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

  1. 1854
    Cass County created Cass created by proclamation of the acting governor of Nebraska Territory from non-county area. · Neb. Terr. Gov. Proc. 1854, p. 47
  2. 1855
    Gained territory Cass gained from Pierce (original, extinct), lost to creation of Greene (now Seward), Lancaster, Otoe (spelled Ottoe here), and York.
    from Piercefrom Greenefrom Sewardfrom Lancasterfrom Otoefrom Ottoefrom York
    · Neb. Terr. Laws 1855, 1st reg. sess., p. 336
  3. 1856
    Boundary clarified Cass boundaries redefined; gained from Lancaster.
    with Lancasterno change
    · Neb. Terr. Laws 1855-1856, 2d reg. sess., sec. 5/p. 183
  4. 1865
    Changed Saunders attached to Cass "for judicial, election and revenue purposes;" act repealed 18 February 1867.
    Saunders
    · Neb. Terr. Laws 1865, 10th reg. sess., p. 134
  5. 1866
    Lost territory Cass lost small area to Saunders. Act passed 12 February 1866; took effect 1 July 1866.
    to Saunders
    · Neb. Terr. Rev. Stat. 1866, 11th sess., pp. 707-708
  6. 1867
    Changed Saunders detached from Cass; act of 8 February 1865 repealed.
    Saunders
    · Neb. Terr. Laws 1867,12th reg. sess., p. 50
  7. 1955
    Boundary clarified Cass boundary was clarified along the Missouri River.
    no change
    · Neb. Laws 1955, 67th sess., ch. 65, sec. 2/p. 212

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
26,598 2020 Census count
Housing units
11,623 2020 Census count
Land area
557 square miles
Water area
8.5 square miles
People per sq mi
48 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

Cass 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 Cass County

When was Cass County founded?
Cass County was founded in 1854, and named after Lewis Cass.
What is the county seat of Cass County?
The county seat of Cass County is Plattsmouth.
Is there an online parcel map for Cass County?
Yes. A public source publishes a parcel map of 20,474 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 1854. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Saunders County, Greene County and Lancaster County.
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