Cass County, Nebraska

Cass County, Nebraska
The Cass County Courthouse in Plattsmouth
Location within the U.S. state of Nebraska
Coordinates: 40°54′36″N 96°08′26″W / 40.909878°N 96.140609°W / 40.909878; -96.140609
Country United States
State Nebraska
FoundedNovember 23, 1854
Named afterLewis Cass
SeatPlattsmouth
Largest cityPlattsmouth
Area
 • Total
565.891 sq mi (1,465.65 km2)
 • Land556.911 sq mi (1,442.39 km2)
 • Water8.980 sq mi (23.26 km2)  1.59%
Population
 (2020)
 • Total
26,598
 • Estimate 
(2024)
27,492
 • Density47.760/sq mi (18.440/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Area code402 and 531
Congressional district1st
Websitecasscountyne.gov
• Nebraska county number 13
• Nebraska license plate prefix 20

Cass County is a county in the U.S. state of Nebraska. As of the 2020 census, the population was 26,598. and was estimated to be 27,492 in 2024. The county seat and the largest city is Plattsmouth.

Cass County is included in the Omaha–Council Bluffs metropolitan area.

In the Nebraska license plate system, Cass County was represented by the prefix "20" (as it had the 20th-largest number of vehicles registered in the state when the license plate system was established in 1922).