| ZIP Codes: | 14 ZIP Codes (11 Standard, 2 PO Box, 1 Unique) [See All] |
| Area Code: | 319 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:11:53 PM |
| Population: | 153,959 [See All] |
| FIPS: | 19103 |
| CBSA: | Iowa City, IA |
| Land Area: | 515 sq mi |
| Water Area: | 10 sq mi |
| Coordinates: | 41.6766, -91.5693 |
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153,959 residents live across 14 ZIPs covering 515 sq mi, served by 9 distinct USPS-recognized cities.
Population moved from 133,920 to 153,959 from 2014 to 2024 — a +15.0% change. 9 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 52338 (Swisher, $119,605 median) and poorest ZIP 52240 (Iowa City, $52,960) are 18.1 miles apart — a 2.3× income gap across local geography.
Median home values vary 1.6× across this county — from $240,200 in 52235 (Hills) to $392,700 in 52338 (Swisher).
Density varies 270× across the county — from 25 people/sq mi in 52322 (Oxford) to 6,782 in 52242 (Iowa City).
Educational attainment ranges from 21.4% bachelor's+ in 52755 (Lone Tree) to 67.3% in 52246 (Iowa City) — the breadth of educational profiles across the area.
Within Iowa, this is the #4 most populous of 99 counties and ranks #11 for median household income with the #4 fastest decade growth .
Hosts 1 single-entity Unique ZIP: 52243American College Testing .
Weighted by population, the typical household earns about $76,764 across the county — reflecting what a typical resident sees, not a simple ZIP average.
55.6% of adults age 25+ hold a bachelor's degree or higher (51,263 of 92,178 reporting). The most-educated ZIPs cluster around Iowa City.
11 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 |
|---|---|---|---|---|---|---|
| 52240 | Iowa City | Standard | 35,074 | $52,960 | 141.5 | 5.4% |
| 52241 | Coralville | Standard | 23,250 | $69,243 | 13.8 | 18.0% |
| 52317 | North Liberty | Standard | 23,097 | $105,318 | 38.1 | 42.5% |
| 52245 | Iowa City | Standard | 22,853 | $78,020 | 9.0 | -2.3% |
| 52246 | Iowa City | Standard | 22,308 | $62,521 | 16.5 | -0.7% |
| 52333 | Solon | Standard | 7,295 | $118,721 | 94.0 | 7.9% |
| 52340 | Tiffin | Standard | 6,128 | $98,393 | 18.1 | 212.2% |
| 52242 | Iowa City | Standard | 4,688 | — | 0.7 | 180.7% |
| 52338 | Swisher | Standard | 3,934 | $119,605 | 30.4 | 18.4% |
| 52322 | Oxford | Standard | 2,266 | $64,444 | 90.3 | -3.9% |
| 52755 | Lone Tree | Standard | 2,092 | $102,434 | 60.9 | 5.2% |
| 52235 | Hills | PO Box | 974 | $83,333 | 1.7 | 21.6% |
| 52244 | Iowa City | PO Box | — | — | 0.0 | — |
| 52243 | Iowa City | Unique | — | — | 0.0 | — |