Rock Falls Illinois ZIP Codes
Rock Falls holds a single ZIP code.
Every ZIP code in Rock Falls
| ZIP code | County |
|---|---|
| 61071 | Whiteside 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Rock Falls codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Rock Falls. 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 Rock Falls ZIP code begins 610. Those first three digits identify the sectional center facility that processes mail for this part of Illinois. Statewide that range covers 66 ZIP codes, so Rock Falls accounts for 2% of it.
Every Illinois ZIP prefix and the region it covers →
Area codes covering Rock Falls
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground Rock Falls occupies.
Rock Falls Illinois area codes in full →
Where Rock Falls's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Rock Falls
| City | Distance | ZIP codes |
|---|---|---|
| Sterling Illinois ZIP codes | 1.9 mi | 1 ZIP code |
| Harmon Illinois ZIP codes | 8.0 mi | 1 ZIP code |
| Tampico Illinois ZIP codes | 11 mi | 1 ZIP code |
| Deer Grove Illinois ZIP codes | 11 mi | 1 ZIP code |
| Dixon Illinois ZIP codes | 12 mi | 1 ZIP code |
| Lyndon Illinois ZIP codes | 12 mi | 1 ZIP code |
| Milledgeville Illinois ZIP codes | 14 mi | 1 ZIP code |
| Morrison Illinois ZIP codes | 14 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.