County ZIP codes · Iowa · FIPS 19103
Johnson County, IA ZIP Codes
Johnson County, Iowa has 26 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 24 residential and 2 for PO boxes or a single organization. 13 of the residential ones lie mainly in Johnson County and 11 mainly in a neighboring county; 15 cross the county line. Median household income ranges from $52,960 in 52240 (Iowa City) to $120,230 in 52227 (Ely) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Johnson 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 $78,020 and $105,318.
They carry 21 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 24 residential ZIP codes in Johnson County
13 ZIP codes lie mainly in Johnson County; 11 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 52240 | Iowa City | 35,074 | 247 | $53k | $242k | 100% |
| 52241 | Coralville | 23,250 | 1,721 | $69k | $299k | 100% |
| 52317 | North Liberty | 23,097 | 672 | $105k | $323k | 100% |
| 52245 | Iowa City | 22,853 | 2,722 | $78k | $315k | 100% |
| 52246 | Iowa City | 22,308 | 1,335 | $63k | $349k | 100% |
| 52333 | Solon | 7,295 | 85 | $119k | $367k | 96% |
| 52340 | Tiffin | 6,128 | 322 | $98k | $343k | 100% |
| 52247 | Kalona | 5,914 | 73 | $92k | $299k | 55% |
| 52242 | Iowa City | 4,688 | 6,547 | – | – | 100% |
| 52338 | Swisher | 3,934 | 118 | $120k | $393k | 94% |
| 52322 | Oxford | 2,266 | 26 | $64k | $261k | 99% |
| 52755 | Lone Tree | 2,092 | 36 | $102k | $243k | 92% |
| 52235 | Hills | 974 | 453 | $83k | $240k | 100% |
Partly in Johnson County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 52327 | Riverside | 3,796 | 47 | $87k | $299k | 27% |
| 52203 | Amana | 2,231 | 42 | $102k | $297k | 21% |
| 52358 | West Branch | 3,598 | 46 | $92k | $240k | 17% |
| 52325 | Parnell | 477 | 12 | $76k | – | 14% |
| 52228 | Fairfax | 3,802 | 102 | $118k | $309k | 11% |
| 52253 | Lisbon | 2,622 | 56 | $105k | $238k | 9% |
| 52356 | Wellman | 2,664 | 28 | $57k | $228k | 8% |
| 52227 | Ely | 2,996 | 102 | $120k | $342k | 7% |
| 52766 | Nichols | 677 | 14 | $62k | $128k | 6% |
| 52404 | Cedar Rapids | 42,958 | 758 | $62k | $169k | 5% |
| 52776 | West Liberty | 5,090 | 58 | $80k | $204k | 3% |
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?
16 ZIP codes of Johnson County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Johnson | Elsewhere |
|---|---|---|
| 52404 | 5% | Linn County 95% |
| 52333 | 96% | Cedar County 4% |
| 52247 | 55% | Washington County 45% |
| 52776 | 3% | Muscatine County 62%; Cedar County 34% |
| 52338 | 94% | Linn County 6% |
| 52228 | 11% | Linn County 76%; Benton County 13% |
| 52327 | 27% | Washington County 73% |
| 52358 | 17% | Cedar County 83% |
| 52227 | 7% | Linn County 93% |
| 52356 | 8% | Washington County 74%; Iowa County 17%; Keokuk County 1% |
| 52253 | 9% | Cedar County 50%; Linn County 24%; Jones County 18% |
| 52322 | 99% | |
| 52203 | 21% | Iowa County 79% |
| 52755 | 92% | Louisa County 8% |
| 52766 | 6% | Muscatine County 94% |
| 52325 | 14% | Iowa County 86% |
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 Johnson County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Johnson County's ZIP codes use 4 prefixes: 522, 523, 524 and 527.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 522 | Cedar Rapids, IA (SCF 522) | 13 | 50 |
| 523 | Cedar Rapids, IA (SCF 522) | 9 | 53 |
| 524 | Cedar Rapids, IA (SCF 522) | 1 | 14 |
| 527 | Quad Cities, IL (SCF 612) | 3 | 47 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.