Janesville Iowa ZIP Codes
Janesville holds a single ZIP code.
Every ZIP code in Janesville
| ZIP code | County |
|---|---|
| 50647 | Bremer County |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Janesville codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Janesville. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.
How these codes cluster
Every Janesville ZIP code begins 506. Those first three digits identify the sectional center facility that processes mail for this part of Iowa. Statewide that range covers 70 ZIP codes, so Janesville accounts for 1% of it.
Every Iowa ZIP prefix and the region it covers →
Area codes covering Janesville
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The code below serves the same ground Janesville occupies.
Janesville Iowa area codes in full →
Where Janesville's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Janesville
| City | Distance | ZIP codes |
|---|---|---|
| Waverly Iowa ZIP codes | 5.3 mi | 1 ZIP code |
| Denver Iowa ZIP codes | 6.7 mi | 1 ZIP code |
| Shell Rock Iowa ZIP codes | 7.6 mi | 1 ZIP code |
| Cedar Falls Iowa ZIP codes | 8.8 mi | 2 ZIP codes |
| New Hartford Iowa ZIP codes | 9.7 mi | 1 ZIP code |
| Waterloo Iowa ZIP codes | 12 mi | 4 ZIP codes |
| Readlyn Iowa ZIP codes | 13 mi | 1 ZIP code |
| Clarksville Iowa ZIP codes | 14 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.