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County ZIP codes · Iowa · FIPS 19041

Clay County, IA ZIP Codes

Clay County, Iowa has 17 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 10 of the residential ones lie mainly in Clay County and 7 mainly in a neighboring county; 11 cross the county line. Median household income ranges from $63,036 in 51058 (Sutherland) to $72,426 in 51346 (Hartley) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Clay County?

50515 · Ayrshire: $63k50565 · Marathon: $52k50585 · Sioux Rapids: $71k51033 · Linn Grove: $61k51047 · Peterson: $101k51058 · Sutherland: $63k51301 · Spencer: $63k51333 · Dickens: $111k51338 · Everly: $58k51340 · Fostoria: $90k51341 · Gillett Grove: –51343 · Greenville: $61k51346 · Hartley: $72k51357 · Royal: $68k51358 · Ruthven: $65k51364 · Terril: $67k51366 · Webb: $88k51346513015135851047510585058551338513335136451357510335136650515505655134350515 · Ayrshire: $63k50565 · Marathon: $52k50585 · Sioux Rapids: $71k51033 · Linn Grove: $61k51047 · Peterson: $101k51058 · Sutherland: $63k51301 · Spencer: $63k51333 · Dickens: $111k51338 · Everly: $58k51340 · Fostoria: $90k51341 · Gillett Grove: –51343 · Greenville: $61k51346 · Hartley: $72k51357 · Royal: $68k51358 · Ruthven: $65k51364 · Terril: $67k51366 · Webb: $88k51346513015135851047510585058551338513335136451357510335136650515505655134350515 · Ayrshire: $63k50565 · Marathon: $52k50585 · Sioux Rapids: $71k51033 · Linn Grove: $61k51047 · Peterson: $101k51058 · Sutherland: $63k51301 · Spencer: $63k51333 · Dickens: $111k51338 · Everly: $58k51340 · Fostoria: $90k51341 · Gillett Grove: –51343 · Greenville: $61k51346 · Hartley: $72k51357 · Royal: $68k51358 · Ruthven: $65k51364 · Terril: $67k51366 · Webb: $88k513465130151358510475105850585513385133351364513575103351366505155056551343
The residential ZIP codes of Clay 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 $63,402 and $71,346.

They carry 17 postal town names.

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

All 17 residential ZIP codes in Clay County

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

Residential ZIP codes mainly in Clay County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
51301 Spencer 12,638 80 $63k $188k 100%
51357 Royal 910 24 $68k $119k 100%
51338 Everly 852 12 $58k $125k 79%
51047 Peterson 693 9 $101k $130k 55%
51033 Linn Grove 421 7 $61k $182k 50%
51333 Dickens 374 6 $111k $196k 100%
51366 Webb 245 4 $88k $131k 97%
51343 Greenville 172 6 $61k $99k 100%
51340 Fostoria 75 625 $90k $134k 100%
51341 Gillett Grove 40 117 – $61k 100%

Partly in Clay County

Residential ZIP codes mainly in another county that reach at least 1% into Clay County, by their share here
In this county
50585 Sioux Rapids 1,080 16 $71k $121k 48%
51358 Ruthven 1,213 15 $65k $151k 36%
50515 Ayrshire 251 7 $63k $29k 23%
51364 Terril 803 13 $67k $157k 13%
51346 Hartley 2,247 15 $72k $157k 8%
50565 Marathon 380 9 $52k $60k 5%
51058 Sutherland 1,096 13 $63k $133k 1%

Download the 17 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?

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

Share of each ZIP code's land in Clay County and in the neighboring counties
ZIPIn ClayElsewhere
513468%O'Brien County 71%; Osceola County 20%
5135836%Palo Alto County 64%
510581%O'Brien County 93%; Cherokee County 6%
5058548%Buena Vista County 52%
5133879%Dickinson County 21%
5136413%Dickinson County 76%; Emmet County 12%
5104755%Buena Vista County 27%; Cherokee County 13%; O'Brien County 5%
5103350%Buena Vista County 50%
505655%Buena Vista County 95%
5051523%Palo Alto County 77%
5136697%Buena Vista County 3%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Clay County's ZIP codes use 3 prefixes: 505, 510 and 513.

Three-digit prefixes of Clay 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 Clay County's
PrefixSectional centerHereAll codes
505 Des Moines, IA (SCF 500) 3 75
510 Sioux Falls, SD (SCF 570) 3 55
513 Sioux Falls, SD (SCF 570) 11 23

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