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County ZIP codes · Iowa · FIPS 19189

Winnebago County, IA ZIP Codes

Winnebago County, Iowa has 10 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 7 of the residential ones lie mainly in Winnebago County and 3 mainly in a neighboring county; 6 cross the county line. Median household income ranges from $74,940 in 50436 (Forest City) to $76,125 in 50450 (Lake Mills) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Winnebago County?

50424 · Buffalo Center: $59k50436 · Forest City: $75k50446 · Joice: $107k50450 · Lake Mills: $76k50453 · Leland: $78k50465 · Rake: $42k50473 · Scarville: $50k50478 · Thompson: $49k50480 · Titonka: $73k50484 · Woden: $66k5042450436504505047850480504535044650484504735046550424 · Buffalo Center: $59k50436 · Forest City: $75k50446 · Joice: $107k50450 · Lake Mills: $76k50453 · Leland: $78k50465 · Rake: $42k50473 · Scarville: $50k50478 · Thompson: $49k50480 · Titonka: $73k50484 · Woden: $66k50424504365045050478504805045350446504845047350424 · Buffalo Center: $59k50436 · Forest City: $75k50446 · Joice: $107k50450 · Lake Mills: $76k50453 · Leland: $78k50465 · Rake: $42k50473 · Scarville: $50k50478 · Thompson: $49k50480 · Titonka: $73k50484 · Woden: $66k504245043650450504785048050453504465048450473
The residential ZIP codes of Winnebago 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?

They carry 10 postal town names.

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

All 10 residential ZIP codes in Winnebago County

7 ZIP codes lie mainly in Winnebago County; 3 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Winnebago County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
50436 Forest City 5,771 43 $75k $168k 58%
50450 Lake Mills 2,952 35 $76k $158k 68%
50424 Buffalo Center 1,441 10 $59k $115k 62%
50478 Thompson 737 10 $49k $93k 100%
50453 Leland 537 12 $78k $154k 100%
50473 Scarville 219 6 $50k $141k 100%
50465 Rake 190 57 $42k $49k 100%

Partly in Winnebago County

Residential ZIP codes mainly in another county that reach at least 1% into Winnebago County, by their share here
In this county
50484 Woden 411 9 $66k $101k 33%
50446 Joice 476 12 $107k $154k 12%
50480 Titonka 809 13 $73k $90k 1%

Download the 10 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?

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

Share of each ZIP code's land in Winnebago County and in the neighboring counties
ZIPIn WinnebagoElsewhere
5043658%Hancock County 42%
5045068%Worth County 32%
5042462%Kossuth County 38%
504801%Kossuth County 97%; Hancock County 2%
5044612%Worth County 88%
5048433%Hancock County 64%; Kossuth County 2%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Winnebago County starts with 504.

Three-digit prefixes of Winnebago 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 Winnebago County's
PrefixSectional centerHereAll codes
504 Waterloo, IA (SCF 506) 10 57

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