Cass County is a county in Nebraska, United States, on the state’s eastern edge along the Missouri River. It had a population of 26,598 at the 2020 census and covers 566 square miles (1,466 km2), centred near 40°54′36″N 96°08′26″W.
Plattsmouth is the county seat and largest city; its postal code is 68048. The county has 3 cities, 12 villages and several unincorporated communities, and it observes the Central time zone. Cass County is part of the Omaha–Council Bluffs metropolitan area.
Towns & Villages in Cass County
Cass County has 15 incorporated places — 3 cities and 12 villages — plus a handful of unincorporated communities and mobile-home-park subdivisions. In the table below, “City · seat” marks the county seat, “City” and “Village” are incorporated municipalities, and “Unincorp.” marks places with no municipal government of their own.
| Place | Type | Pop. | ZIP |
|---|---|---|---|
| Plattsmouth | City · seat | — | 68048 |
| Louisville | City | — | 68037 |
| Weeping Water | City | — | 68463 |
| Alvo | Village | — | 68304 |
| Avoca | Village | — | 68307 |
| Cedar Creek | Village | — | 68016 |
| Eagle | Village | — | 68347 |
| Elmwood | Village | — | 68349 |
| Greenwood | Village | — | 68366 |
| Manley | Village | — | 68403 |
| Murdock | Village | — | 68407 |
| Murray | Village | — | 68409 |
| Nehawka | Village | — | 68413 |
| South Bend | Village | — | 68058 |
| Union | Village | — | 68455 |
| Mynard | Unincorp. | — | — |
| Oreapolis | Unincorp. | — | — |
| Wabash | Unincorp. | — | — |
| Cullom | Unincorp. | — | — |
| Todd | Unincorp. | — | — |
| Accent MH Parks | Unincorp. | — | — |
| HiVue MH Park | Unincorp. | — | — |
| Hill City MH Park | Unincorp. | — | — |
| Roberts MH Court | Unincorp. | — | — |
| South Side MH Park | Unincorp. | — | — |
Several of the unincorporated names on the list — Accent MH Parks, HiVue MH Park, Hill City MH Park, Roberts MH Court and South Side MH Park — are manufactured-home-park subdivisions rather than traditional hamlets; they carry no separate ZIP code and use their nearest post office town’s address.
ZIP Codes
- 68048 — Plattsmouth
- 68037 — Louisville
- 68463 — Weeping Water
- 68304 — Alvo
- 68307 — Avoca
- 68016 — Cedar Creek
- 68347 — Eagle
- 68349 — Elmwood
- 68366 — Greenwood
- 68403 — Manley
- 68407 — Murdock
- 68409 — Murray
- 68413 — Nehawka
- 68058 — South Bend
- 68455 — Union
Unincorporated communities and mobile-home-park subdivisions use the ZIP code of their nearest post office town above.
Geography
Cass County sits on Nebraska’s eastern edge, in the rolling loess hills above the Missouri River, which forms the county’s entire eastern boundary with Iowa. Of the county’s 566 square miles, about 557 square miles are land and 9 square miles are water. The Platte River crosses the county’s northeast corner just before it joins the Missouri.
Cass County borders Sarpy County to the north, Otoe County to the south, Saunders County to the northwest, and Lancaster County to the west. Across the Missouri River to the east lie counties in southwest Iowa.
Demographics
Cass County had 26,598 residents at the 2020 census, on 566 square miles of land and water — a density of roughly 47 people per square mile. Plattsmouth and Louisville are the county’s two largest communities. The Nebraska median household income is $74,590; Cass County, as an Omaha-metro commuter county, tends to run above that state figure, though a county-specific verified estimate is not cited here.
Economy & Local Life
Cass County’s economy blends commuter households working in the Omaha–Council Bluffs metro with local agriculture — corn and soybeans on the upland farmland away from the river bluffs. Plattsmouth, the county seat, sits directly on the Missouri River and anchors the county’s retail and government services. Weeping Water and Louisville serve as secondary local hubs for the county’s western and central townships.
History
Cass County was organized on November 23, 1854, one of Nebraska Territory’s original counties, and named for Lewis Cass, the Michigan general, senator and U.S. secretary of state and war who never lived in the territory that carries his name. Plattsmouth, at the mouth of the Platte River on the Missouri, was platted the same year and became the county seat, growing as a steamboat landing and later a railroad town.
Getting There
U.S. Route 34 and U.S. Route 75 cross Cass County, linking Plattsmouth to Omaha and Lincoln.
- Omaha — about 20 miles north
- Lincoln — about 30 miles west
- Nebraska City — about 20 miles south
- Council Bluffs, Iowa — about 25 miles northeast
The nearest commercial airport is Eppley Airfield in Omaha.
Frequently Asked Questions
Where is Cass County, Nebraska?
It is in eastern Nebraska, on the Missouri River across from southwest Iowa, just south of the Omaha metro area.
What is the population of Cass County?
26,598 at the 2020 census.
How big is Cass County?
About 566 square miles (1,466 km2), including roughly 9 square miles of water.
What is the county seat of Cass County?
Plattsmouth is the county seat and largest city.
How many towns are in Cass County?
Three cities (Plattsmouth, Louisville, Weeping Water) and twelve villages, plus several unincorporated communities.
What ZIP codes are in Cass County?
Fifteen ZIP codes, from 68016 (Cedar Creek) to 68463 (Weeping Water); see the ZIP Codes section above.
What river runs through Cass County?
The Missouri River forms the county’s eastern border, and the Platte River crosses its northeast corner.
More counties in this state: Towns and villages in Nebraska.