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County ZIP codes · Iowa · FIPS 19055

Delaware County, IA ZIP Codes

Delaware County, Iowa has 16 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 9 of the residential ones lie mainly in Delaware County and 7 mainly in a neighboring county; 10 cross the county line. Median household income ranges from $69,635 in 52057 (Manchester) to $89,697 in 52041 (Earlville) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Delaware County?

50654 · Masonville: $53k52035 · Colesburg: $62k52036 · Delaware: $85k52038 · Dundee: $56k52040 · Dyersville: $85k52041 · Earlville: $90k52042 · Edgewood: $96k52050 · Greeley: $67k52057 · Manchester: $70k52065 · New Vienna: $99k52076 · Strawberry Point: $73k52078 · Worthington: $98k52218 · Coggon: $82k52223 · Delhi: $89k52237 · Hopkinton: $84k52330 · Ryan: $87k52057520765223752218520405204152035506545204252065523305222352050520785203850654 · Masonville: $53k52035 · Colesburg: $62k52036 · Delaware: $85k52038 · Dundee: $56k52040 · Dyersville: $85k52041 · Earlville: $90k52042 · Edgewood: $96k52050 · Greeley: $67k52057 · Manchester: $70k52065 · New Vienna: $99k52076 · Strawberry Point: $73k52078 · Worthington: $98k52218 · Coggon: $82k52223 · Delhi: $89k52237 · Hopkinton: $84k52330 · Ryan: $87k52057520765223752218520405204152035506545204252065523305222352050520785203850654 · Masonville: $53k52035 · Colesburg: $62k52036 · Delaware: $85k52038 · Dundee: $56k52040 · Dyersville: $85k52041 · Earlville: $90k52042 · Edgewood: $96k52050 · Greeley: $67k52057 · Manchester: $70k52065 · New Vienna: $99k52076 · Strawberry Point: $73k52078 · Worthington: $98k52218 · Coggon: $82k52223 · Delhi: $89k52237 · Hopkinton: $84k52330 · Ryan: $87k520575207652237522185204052041520355065452042520655233052223520505207852038
The residential ZIP codes of Delaware 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 16 postal town names.

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

All 16 residential ZIP codes in Delaware County

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

Residential ZIP codes mainly in Delaware County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
52057 Manchester 8,193 59 $70k $184k 100%
52040 Dyersville 5,584 90 $85k $242k 54%
52237 Hopkinton 1,830 22 $84k $167k 96%
52041 Earlville 1,468 25 $90k $189k 100%
52223 Delhi 1,199 25 $89k $204k 100%
52330 Ryan 940 20 $87k $261k 100%
52038 Dundee 463 17 $56k $165k 100%
52050 Greeley 422 13 $67k $232k 88%
52036 Delaware 135 315 $85k $144k 100%

Partly in Delaware County

Residential ZIP codes mainly in another county that reach at least 1% into Delaware County, by their share here
In this county
50654 Masonville 275 5 $53k $124k 48%
52035 Colesburg 1,331 27 $62k $139k 38%
52078 Worthington 870 21 $98k $238k 36%
52065 New Vienna 671 14 $99k $219k 25%
52218 Coggon 1,413 19 $82k $181k 20%
52042 Edgewood 1,804 30 $96k $234k 19%
52076 Strawberry Point 2,258 22 $73k $151k 16%

Download the 16 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?

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

Share of each ZIP code's land in Delaware County and in the neighboring counties
ZIPIn DelawareElsewhere
5204054%Dubuque County 46%
5207616%Clayton County 83%
5223796%Jones County 3%; Dubuque County 2%
5204219%Clayton County 81%
5221820%Linn County 56%; Buchanan County 24%
5203538%Clayton County 62%
5207836%Dubuque County 64%
5206525%Dubuque County 75%
5205088%Clayton County 12%
5065448%Buchanan County 52%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Delaware County's ZIP codes use 4 prefixes: 506, 520, 522 and 523.

Three-digit prefixes of Delaware 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 Delaware County's
PrefixSectional centerHereAll codes
506 Waterloo, IA (SCF 506) 1 70
520 Cedar Rapids, IA (SCF 522) 11 46
522 Cedar Rapids, IA (SCF 522) 3 50
523 Cedar Rapids, IA (SCF 522) 1 53

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