Plain

County ZIP codes · Iowa · FIPS 19065

Fayette County, IA ZIP Codes

Fayette County, Iowa has 23 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 15 of the residential ones lie mainly in Fayette County and 8 mainly in a neighboring county; 15 cross the county line. Median household income ranges from $48,646 in 50662 (Oelwein) to $103,106 in 50629 (Fairbank) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Fayette County?

50606 · Arlington: $61k50607 · Aurora: $55k50629 · Fairbank: $103k50650 · Lamont: $58k50655 · Maynard: $59k50662 · Oelwein: $49k50664 · Oran: $52k50671 · Stanley: $57k50674 · Sumner: $73k50681 · Westgate: $73k52133 · Castalia: $76k52135 · Clermont: $88k52141 · Elgin: $65k52142 · Fayette: $57k52144 · Fort Atkinson: $85k52147 · Hawkeye: $77k52161 · Ossian: $88k52162 · Postville: $64k52164 · Randalia: $48k52166 · Saint Lucas: $111k52169 · Wadena: $52k52171 · Waucoma: $95k52175 · West Union: $60k50674521625217150629521755214152144521425060652161506075214750662521335065552169506505213550681521645067150606 · Arlington: $61k50607 · Aurora: $55k50629 · Fairbank: $103k50650 · Lamont: $58k50655 · Maynard: $59k50662 · Oelwein: $49k50664 · Oran: $52k50671 · Stanley: $57k50674 · Sumner: $73k50681 · Westgate: $73k52133 · Castalia: $76k52135 · Clermont: $88k52141 · Elgin: $65k52142 · Fayette: $57k52144 · Fort Atkinson: $85k52147 · Hawkeye: $77k52161 · Ossian: $88k52162 · Postville: $64k52164 · Randalia: $48k52166 · Saint Lucas: $111k52169 · Wadena: $52k52171 · Waucoma: $95k52175 · West Union: $60k506745216252171506295217552141521445214250606521615060752147506625065552169506505213550681521645067150606 · Arlington: $61k50607 · Aurora: $55k50629 · Fairbank: $103k50650 · Lamont: $58k50655 · Maynard: $59k50662 · Oelwein: $49k50664 · Oran: $52k50671 · Stanley: $57k50674 · Sumner: $73k50681 · Westgate: $73k52133 · Castalia: $76k52135 · Clermont: $88k52141 · Elgin: $65k52142 · Fayette: $57k52144 · Fort Atkinson: $85k52147 · Hawkeye: $77k52161 · Ossian: $88k52162 · Postville: $64k52164 · Randalia: $48k52166 · Saint Lucas: $111k52169 · Wadena: $52k52171 · Waucoma: $95k52175 · West Union: $60k5067452162521715062952175521415214452142506065216150607521475066250655521695213552164
The residential ZIP codes of Fayette 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 $64,125 and $87,870.

They carry 23 postal town names.

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

All 23 residential ZIP codes in Fayette County

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

Residential ZIP codes mainly in Fayette County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
50662 Oelwein 6,576 93 $49k $108k 94%
52175 West Union 3,484 41 $60k $161k 100%
52142 Fayette 1,890 25 $57k $163k 100%
52171 Waucoma 1,314 16 $95k $192k 50%
52141 Elgin 1,259 15 $65k $116k 58%
52147 Hawkeye 911 13 $77k $163k 100%
52135 Clermont 834 30 $88k $121k 92%
50606 Arlington 803 12 $61k $130k 96%
50655 Maynard 739 21 $59k $141k 100%
50681 Westgate 481 20 $73k $113k 100%
52169 Wadena 367 11 $52k $113k 94%
52164 Randalia 187 7 $48k $137k 100%
50671 Stanley 182 8 $57k $108k 61%
52166 Saint Lucas 137 531 $111k $147k 100%
50664 Oran 63 67 $52k $157k 100%

Partly in Fayette County

Residential ZIP codes mainly in another county that reach at least 1% into Fayette County, by their share here
In this county
50674 Sumner 3,446 22 $73k $174k 32%
50650 Lamont 648 16 $58k $121k 31%
52133 Castalia 673 15 $76k $246k 30%
50607 Aurora 403 8 $55k $143k 30%
50629 Fairbank 2,082 28 $103k $207k 22%
52161 Ossian 1,532 29 $88k $171k 14%
52144 Fort Atkinson 1,075 14 $85k $218k 6%
52162 Postville 3,744 39 $64k $133k 3%

Download the 23 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?

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

Share of each ZIP code's land in Fayette County and in the neighboring counties
ZIPIn FayetteElsewhere
5066294%Buchanan County 6%
521623%Allamakee County 60%; Clayton County 27%; Winneshiek County 10%
5067432%Bremer County 62%; Chickasaw County 6%
5062922%Buchanan County 32%; Bremer County 29%; Black Hawk County 16%
5216114%Winneshiek County 86%
5217150%Chickasaw County 31%; Winneshiek County 18%
5214158%Clayton County 42%
521446%Winneshiek County 94%
5213592%Clayton County 8%
5060696%Clayton County 4%
5213330%Winneshiek County 70%
5065031%Buchanan County 69%
5060730%Buchanan County 70%
5216994%Clayton County 6%
5067161%Buchanan County 39%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Fayette County's ZIP codes use 2 prefixes: 506 and 521.

Three-digit prefixes of Fayette 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 Fayette County's
PrefixSectional centerHereAll codes
506 Waterloo, IA (SCF 506) 10 70
521 Waterloo, IA (SCF 506) 13 33

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