ZIP Codes of Cass County, NE

Population & People
Population & People
Total Population
27,153
Household Income
Household Income
Median Income
$92,649
Housing
Housing
Total Housing Units
11,817
Business & Economy
Business & Economy
Total Businesses
619
Employment
Employment
Employment Rate
66.31%
Education
Education
Bachelor's Degree+
31.51%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 15 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:15 ZIP Codes (12 Standard, 3 PO Box, 0 Unique) [See All]
Area Codes:402 / 531
Timezone:Central (GMT -06:00)
Local Time:2:13:04 PM
Population:27,153 [See All]
FIPS:31025
CBSA:Omaha, NE-IA
Land Area:586 sq mi
Water Area:8 sq mi
Coordinates:40.9065, -96.1683
Quick Link:
https://www.zip-codes.com/county/ne-cass.asp
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Among Nebraska's 5 wealthiest counties
#5 statewide, average median income $92,649.
Striking education divide
Bachelor's share spans 9.3% to 43.9% — a 35-point gap.
Owner-dominated county
Just 14.5% of homes are rentals — strong homeownership culture.

Standout ZIPs in this County


Most Populous
Plattsmouth · 13,435 people
49.5% of county total
Highest Income
South Bend · $138,281 median
1.5× county average
Largest Land Area
Plattsmouth · 99.1 sq mi
Spans the most ground
Fastest Growth
Weeping Water · 24.1% (10-yr)
1,475 → 1,831 residents
Most Educated
Louisville · 38.9% bachelor's+
670 of 1,722 adults 25+

Things worth knowing about Cass County


27,153 residents live across 15 ZIPs covering 586 sq mi, served by 15 distinct USPS-recognized cities.

Population moved from 25,240 to 27,153 from 2014 to 2024 — a +7.6% change. 8 ZIPs gained residents, 7 lost.

The county's wealthiest ZIP 68058 (South Bend, $138,281 median) and poorest ZIP 68307 (Avoca, $61,250) are 16.0 miles apart — a 2.3× income gap across local geography.

Median home values vary 3.3× across this county — from $162,500 in 68403 (Manley) to $541,700 in 68058 (South Bend).

Density varies 52× across the county — from 8 people/sq mi in 68307 (Avoca) to 412 in 68403 (Manley).

Educational attainment ranges from 9.3% bachelor's+ in 68307 (Avoca) to 55.2% in 68058 (South Bend) — the breadth of educational profiles across the area.

Within Nebraska, this is the #12 most populous of 107 counties and ranks #5 for median household income with the #14 fastest decade growth .

Weighted by population, the typical household earns about $91,990 across the county — reflecting what a typical resident sees, not a simple ZIP average.

31.5% of adults age 25+ hold a bachelor's degree or higher (5,914 of 18,771 reporting).

12 Standard delivery, 3 PO Box only, 0 single-entity Unique ZIPs serve this county.

Stories about Cass County


Big & sparse

A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.

Total area
586
square miles
Avg density
46.3
people per sq mi
Population
27,153
across 15 ZIPs
Plattsmouth
99.1 sq mi
13,435 residents
Louisville
61.7 sq mi
2,524 residents
Weeping Water
55.9 sq mi
1,831 residents

All ZIP Codes in Cass County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
68048PlattsmouthStandard13,435$89,93199.16.0%
68037LouisvilleStandard2,524$107,83961.723.8%
68347EagleStandard2,508$88,28129.8-1.5%
68463Weeping WaterStandard1,831$85,97255.924.1%
68349ElmwoodStandard1,224$76,36947.119.8%
68366GreenwoodStandard957$90,95252.1-25.5%
68407MurdockStandard878$99,77344.628.6%
68455UnionStandard852$114,64338.658.7%
68409MurrayStandard625$92,04531.4-10.5%
68413NehawkaStandard558$81,94455.6-3.3%
68016Cedar CreekPO Box427$118,4561.4-1.6%
68304AlvoStandard414$79,00024.817.3%
68058South BendPO Box378$138,2811.320.8%
68307AvocaStandard336$61,25042.1-14.5%
68403ManleyPO Box206$65,0000.5-2.8%

Adjacent & Nearby Counties