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County ZIP codes · Iowa · FIPS 19029

Cass County, IA ZIP Codes

Cass County, Iowa has 13 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 8 of the residential ones lie mainly in Cass County and 5 mainly in a neighboring county; 12 cross the county line. Median household income ranges from $63,125 in 50022 (Atlantic) to $76,371 in 51535 (Griswold) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Cass County?

50020 · Anita: $75k50022 · Atlantic: $63k50042 · Brayton: $93k50274 · Wiota: $72k50837 · Bridgewater: $63k50843 · Cumberland: $56k50853 · Massena: $65k50864 · Villisca: $70k51532 · Elliott: $65k51535 · Griswold: $76k51544 · Lewis: $48k51552 · Marne: $90k51577 · Walnut: $72k5086450022515355002051577508435085351544515325083750274500425155250020 · Anita: $75k50022 · Atlantic: $63k50042 · Brayton: $93k50274 · Wiota: $72k50837 · Bridgewater: $63k50843 · Cumberland: $56k50853 · Massena: $65k50864 · Villisca: $70k51532 · Elliott: $65k51535 · Griswold: $76k51544 · Lewis: $48k51552 · Marne: $90k51577 · Walnut: $72k5086450022515355002051577508435085351544515325083750274500425155250020 · Anita: $75k50022 · Atlantic: $63k50042 · Brayton: $93k50274 · Wiota: $72k50837 · Bridgewater: $63k50843 · Cumberland: $56k50853 · Massena: $65k50864 · Villisca: $70k51532 · Elliott: $65k51535 · Griswold: $76k51544 · Lewis: $48k51552 · Marne: $90k51577 · Walnut: $72k5086450022515355002051577508435154451532508375027450042
The residential ZIP codes of Cass County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024).<$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $69,861 and $75,417.

They carry 13 postal town names.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 13 residential ZIP codes in Cass County

8 ZIP codes lie mainly in Cass County; 5 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Cass County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
50022 Atlantic 8,526 49 $63k $158k 89%
51535 Griswold 1,697 13 $76k $152k 56%
50020 Anita 1,197 12 $75k $155k 77%
51544 Lewis 793 16 $48k $81k 74%
50853 Massena 716 10 $65k $169k 98%
50843 Cumberland 540 7 $56k $105k 92%
50274 Wiota 234 5 $72k $162k 100%
51552 Marne 169 6 $90k $125k 63%

Partly in Cass County

Residential ZIP codes mainly in another county that reach at least 1% into Cass County, by their share here
In this county
50837 Bridgewater 282 5 $63k $117k 17%
51532 Elliott 644 11 $65k $99k 3%
50042 Brayton 226 7 $93k $161k 2%
51577 Walnut 1,561 19 $72k $134k 2%
50864 Villisca 1,662 11 $70k $110k 2%

Download the 13 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

12 ZIP codes of Cass County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Cass County and in the neighboring counties
ZIPIn CassElsewhere
5002289%Audubon County7%; Shelby County4%
5153556%Pottawattamie County44%
508642%Montgomery County65%; Page County20%; Taylor County9%; Adams County4%
515772%Pottawattamie County67%; Shelby County31%
5002077%Adair County12%; Audubon County10%; Guthrie County1%
5154474%Pottawattamie County26%
5085398%Adams County2%
515323%Montgomery County86%; Pottawattamie County11%
5084392%Adams County8%
5083717%Adair County70%; Adams County13%
500422%Audubon County98%
5155263%Shelby County37%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

Which first three digits do Cass County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Cass County's ZIP codes use 4 prefixes: 500, 502, 508 and 515.

Three-digit prefixes of Cass County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Cass County's
PrefixSectional centerHereAll codes
500Des Moines, IA (SCF 500)368
502Des Moines, IA (SCF 500)165
508Des Moines, IA (SCF 500)428
515Omaha, NE (SCF 680)557

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.