County ZIP codes · Iowa · FIPS 19013
Black Hawk County, IA ZIP Codes
Black Hawk County, Iowa has 19 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 17 residential and 2 for PO boxes or a single organization. 12 of the residential ones lie mainly in Black Hawk County and 5 mainly in a neighboring county; 9 cross the county line. Median household income ranges from $50,060 in 50703 (Waterloo) to $125,804 in 50643 (Hudson) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Black Hawk 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 $63,441 and $95,353.
They carry 15 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 17 residential ZIP codes in Black Hawk County
12 ZIP codes lie mainly in Black Hawk County; 5 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 50613 | Cedar Falls | 43,867 | 344 | $79k | $271k | 81% |
| 50701 | Waterloo | 30,232 | 382 | $62k | $184k | 100% |
| 50702 | Waterloo | 20,882 | 2,136 | $62k | $151k | 100% |
| 50703 | Waterloo | 17,952 | 193 | $50k | $96k | 100% |
| 50707 | Evansdale | 7,784 | 948 | $63k | $154k | 100% |
| 50648 | Jesup | 4,269 | 51 | $95k | $226k | 58% |
| 50651 | La Porte City | 3,147 | 27 | $88k | $188k | 71% |
| 50643 | Hudson | 3,027 | 53 | $126k | $244k | 91% |
| 50626 | Dunkerton | 1,468 | 29 | $84k | $209k | 100% |
| 50667 | Raymond | 899 | 473 | $77k | $223k | 100% |
| 50634 | Gilbertville | 761 | 2,126 | $80k | $197k | 100% |
| 50623 | Dewar | 153 | 74 | $94k | $171k | 100% |
Partly in Black Hawk County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 50647 | Janesville | 1,978 | 65 | $104k | $314k | 38% |
| 50612 | Buckingham | 369 | 13 | $100k | $292k | 27% |
| 50629 | Fairbank | 2,082 | 28 | $103k | $207k | 16% |
| 50675 | Traer | 2,198 | 20 | $76k | $157k | 2% |
| 50669 | Reinbeck | 2,439 | 25 | $82k | $183k | 1% |
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?
9 ZIP codes of Black Hawk County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Black Hawk | Elsewhere |
|---|---|---|
| 50613 | 81% | Grundy County 15%; Butler County 4% |
| 50648 | 58% | Buchanan County 42% |
| 50651 | 71% | Benton County 26%; Tama County 3% |
| 50643 | 91% | Grundy County 9% |
| 50669 | 1% | Grundy County 69%; Tama County 30% |
| 50675 | 2% | Tama County 98% |
| 50629 | 16% | Buchanan County 32%; Bremer County 29%; Fayette County 22% |
| 50647 | 38% | Bremer County 62% |
| 50612 | 27% | Tama County 73% |
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 Black Hawk County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Black Hawk County's ZIP codes use 2 prefixes: 506 and 507.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.