Oak Brook Illinois ZIP Codes
Oak Brook holds a single ZIP code.
Every ZIP code in Oak Brook
| ZIP code | County |
|---|---|
| 60523 | DuPage 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Oak Brook codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Oak Brook. 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 Oak Brook ZIP code begins 605. Those first three digits identify the sectional center facility that processes mail for this part of Illinois. Statewide that range covers 65 ZIP codes, so Oak Brook accounts for 2% of it.
Every Illinois ZIP prefix and the region it covers →
Area codes covering Oak Brook
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 Oak Brook occupies.
Oak Brook Illinois area codes in full →
Where Oak Brook's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Oak Brook
| City | Distance | ZIP codes |
|---|---|---|
| Clarendon Hills Illinois ZIP codes | 2.6 mi | 1 ZIP code |
| Hinsdale Illinois ZIP codes | 2.8 mi | 2 ZIP codes |
| Westmont Illinois ZIP codes | 3.1 mi | 1 ZIP code |
| Westchester Illinois ZIP codes | 3.3 mi | 1 ZIP code |
| Hillside Illinois ZIP codes | 3.4 mi | 1 ZIP code |
| Western Springs Illinois ZIP codes | 3.6 mi | 1 ZIP code |
| Villa Park Illinois ZIP codes | 3.6 mi | 1 ZIP code |
| Lombard Illinois ZIP codes | 4.1 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.