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County ZIP codes · Iowa · FIPS 19083

Hardin County, IA ZIP Codes

Hardin County, Iowa has 14 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 12 residential and 2 for PO boxes or a single organization. 10 of the residential ones lie mainly in Hardin County and 2 mainly in a neighboring county; 9 cross the county line. Median household income ranges from $55,185 in 50126 (Iowa Falls) to $87,778 in 50230 (Radcliffe) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Hardin County?

50006 · Alden: $70k50102 · Garden City: –50122 · Hubbard: $82k50126 · Iowa Falls: $55k50154 · McCallsburg: $69k50206 · New Providence: $79k50230 · Radcliffe: $88k50258 · Union: $84k50269 · Whitten: $93k50601 · Ackley: $66k50627 · Eldora: $75k50672 · Steamboat Rock: $73k5060150126500065062750230501225025850206506725015450006 · Alden: $70k50102 · Garden City: –50122 · Hubbard: $82k50126 · Iowa Falls: $55k50154 · McCallsburg: $69k50206 · New Providence: $79k50230 · Radcliffe: $88k50258 · Union: $84k50269 · Whitten: $93k50601 · Ackley: $66k50627 · Eldora: $75k50672 · Steamboat Rock: $73k5060150126500065062750230501225025850206506725015450006 · Alden: $70k50102 · Garden City: –50122 · Hubbard: $82k50126 · Iowa Falls: $55k50154 · McCallsburg: $69k50206 · New Providence: $79k50230 · Radcliffe: $88k50258 · Union: $84k50269 · Whitten: $93k50601 · Ackley: $66k50627 · Eldora: $75k50672 · Steamboat Rock: $73k506015012650006506275023050122502585020650672
The residential ZIP codes of Hardin 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 $66,250 and $74,536.

They carry 12 postal town names.

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

All 12 residential ZIP codes in Hardin County

10 ZIP codes lie mainly in Hardin County; 2 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Hardin County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
50126 Iowa Falls 6,368 47 $55k $133k 74%
50627 Eldora 3,276 31 $75k $132k 83%
50006 Alden 1,437 12 $70k $121k 69%
50122 Hubbard 1,297 15 $82k $116k 100%
50230 Radcliffe 1,145 13 $88k $165k 61%
50258 Union 958 18 $84k $110k 71%
50672 Steamboat Rock 611 16 $73k $159k 91%
50206 New Providence 349 8 $79k $113k 81%
50269 Whitten 164 265 $93k $90k 100%
50102 Garden City 36 71 – $110k 100%

Partly in Hardin County

Residential ZIP codes mainly in another county that reach at least 1% into Hardin County, by their share here
In this county
50601 Ackley 2,299 16 $66k $127k 30%
50154 McCallsburg 394 17 $69k $188k 16%

Download the 14 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?

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

Share of each ZIP code's land in Hardin County and in the neighboring counties
ZIPIn HardinElsewhere
5012674%Franklin County 26%
5062783%Grundy County 17%
5060130%Franklin County 36%; Butler County 18%; Grundy County 16%
5000669%Franklin County 30%
5023061%Hamilton County 38%
5025871%Marshall County 29%
5067291%Grundy County 9%
5015416%Story County 84%
5020681%Marshall County 16%; Story County 3%

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

PO Box and single-organization ZIP codes

ZIP codes in Hardin County without a residential area (GeoNames postal codes)
ZIPPostal name
50043Buckeye
50259Gifford

Source: GeoNames postal codes (CC BY 4.0).

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Hardin County's ZIP codes use 4 prefixes: 500, 501, 502 and 506.

Three-digit prefixes of Hardin 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 Hardin County's
PrefixSectional centerHereAll codes
500 Des Moines, IA (SCF 500) 2 68
501 Des Moines, IA (SCF 500) 4 69
502 Des Moines, IA (SCF 500) 5 65
506 Waterloo, IA (SCF 506) 3 70

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