| ZIP Codes: | 18 ZIP Codes (15 Standard, 2 PO Box, 1 Unique) [See All] |
| Area Code: | 563 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:11:52 PM |
| Population: | 101,642 [See All] |
| FIPS: | 19061 |
| CBSA: | Dubuque, IA |
| Land Area: | 815 sq mi |
| Water Area: | 8 sq mi |
| Coordinates: | 42.4743, -90.8817 |
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101,642 residents live across 18 ZIPs covering 815 sq mi, served by 14 distinct USPS-recognized cities.
Population moved from 98,079 to 101,413 from 2014 to 2024 — a +3.4% change. 10 ZIPs gained residents, 5 lost.
The county's wealthiest ZIP 52068 (Peosta, $125,901 median) and poorest ZIP 52001 (Dubuque, $61,643) are 11.6 miles apart — a 2.0× income gap across local geography.
Median home values vary 2.0× across this county — from $178,000 in 52001 (Dubuque) to $361,700 in 52068 (Peosta).
Density varies 99× across the county — from 14 people/sq mi in 52032 (Bernard) to 1,345 in 52001 (Dubuque).
Educational attainment ranges from 9.7% bachelor's+ in 52032 (Bernard) to 46.2% in 52003 (Dubuque) — the breadth of educational profiles across the area.
Within Iowa, this is the #8 most populous of 99 counties and ranks #7 for median household income .
Hosts 1 single-entity Unique ZIP: 52099Mcgraw Hill Companies .
Weighted by population, the typical household earns about $80,576 across the county — reflecting what a typical resident sees, not a simple ZIP average.
33.0% of adults age 25+ hold a bachelor's degree or higher (22,720 of 68,846 reporting). The most-educated ZIPs cluster around Dubuque.
15 Standard delivery, 2 PO Box only, 1 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 52001 | Dubuque | Standard | 43,101 | $61,643 | 32.0 | -1.3% |
| 52002 | Dubuque | Standard | 17,005 | $91,036 | 29.5 | 9.6% |
| 52003 | Dubuque | Standard | 13,796 | $98,908 | 59.0 | 4.2% |
| 52040 | Dyersville | Standard | 5,584 | $84,761 | 65.3 | -2.5% |
| 52068 | Peosta | Standard | 5,280 | $125,901 | 42.1 | 25.9% |
| 52033 | Cascade | Standard | 3,292 | $69,023 | 103.9 | 0.5% |
| 52046 | Farley | Standard | 3,129 | $96,151 | 44.5 | 44.2% |
| 52045 | Epworth | Standard | 2,777 | $91,667 | 56.1 | 8.9% |
| 52073 | Sherrill | Standard | 1,381 | $95,526 | 49.0 | 9.6% |
| 52032 | Bernard | Standard | 1,305 | $88,500 | 96.4 | -11.6% |
| 52053 | Holy Cross | Standard | 1,148 | $83,000 | 56.1 | 9.0% |
| 52039 | Durango | Standard | 1,079 | $79,345 | 34.9 | -1.4% |
| 52079 | Zwingle | Standard | 995 | $101,120 | 55.1 | 16.5% |
| 52078 | Worthington | Standard | 870 | $97,778 | 41.6 | 3.2% |
| 52065 | New Vienna | Standard | 671 | $99,250 | 48.7 | -41.6% |
| 52056 | Luxemburg | PO Box | 229 | $83,750 | 0.5 | — |
| 52004 | Dubuque | PO Box | — | — | 0.0 | — |
| 52099 | Dubuque | Unique | — | — | 0.0 | — |