County ZIP codes · Iowa · FIPS 19061
Dubuque County, IA ZIP Codes
Dubuque County, Iowa has 22 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 20 residential and 2 for PO boxes or a single organization. 13 of the residential ones lie mainly in Dubuque County and 7 mainly in a neighboring county; 12 cross the county line. Median household income ranges from $61,528 in 52052 (Guttenberg) to $125,901 in 52068 (Peosta) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Dubuque County?
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 $69,023 and $91,036.
They carry 18 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 20 residential ZIP codes in Dubuque County
13 ZIP codes lie mainly in Dubuque County; 7 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 52001 | Dubuque | 43,101 | 1,650 | $62k | $178k | 100% |
| 52002 | Dubuque | 17,005 | 583 | $91k | $299k | 100% |
| 52003 | Dubuque | 13,796 | 245 | $99k | $286k | 100% |
| 52068 | Peosta | 5,280 | 122 | $126k | $362k | 100% |
| 52046 | Farley | 3,129 | 65 | $96k | $274k | 100% |
| 52045 | Epworth | 2,777 | 58 | $92k | $264k | 100% |
| 52073 | Sherrill | 1,381 | 29 | $96k | $297k | 92% |
| 52032 | Bernard | 1,305 | 13 | $89k | $269k | 47% |
| 52053 | Holy Cross | 1,148 | 20 | $83k | $252k | 78% |
| 52039 | Durango | 1,079 | 31 | $79k | $331k | 100% |
| 52078 | Worthington | 870 | 21 | $98k | $238k | 64% |
| 52065 | New Vienna | 671 | 14 | $99k | $219k | 75% |
| 52056 | Luxemburg | 229 | 485 | $84k | $183k | 100% |
Partly in Dubuque County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 52040 | Dyersville | 5,584 | 90 | $85k | $242k | 46% |
| 52079 | Zwingle | 995 | 17 | $101k | $238k | 45% |
| 52033 | Cascade | 3,292 | 33 | $69k | $214k | 42% |
| 52052 | Guttenberg | 2,999 | 33 | $62k | $197k | 11% |
| 52054 | La Motte | 794 | 14 | $104k | $225k | 7% |
| 52031 | Bellevue | 5,403 | 32 | $87k | $245k | 5% |
| 52237 | Hopkinton | 1,830 | 22 | $84k | $167k | 2% |
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?
12 ZIP codes of Dubuque County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Dubuque | Elsewhere |
|---|---|---|
| 52040 | 46% | Delaware County 54% |
| 52031 | 5% | Jackson County 95% |
| 52033 | 42% | Jones County 58% |
| 52052 | 11% | Clayton County 90% |
| 52237 | 2% | Delaware County 96%; Jones County 3% |
| 52073 | 92% | Clayton County 8% |
| 52032 | 47% | Jackson County 46%; Jones County 7% |
| 52053 | 78% | Clayton County 22% |
| 52079 | 45% | Jackson County 55% |
| 52078 | 64% | Delaware County 36% |
| 52054 | 7% | Jackson County 93% |
| 52065 | 75% | Delaware County 25% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Dubuque County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Dubuque County's ZIP codes use 2 prefixes: 520 and 522.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.