Postal reference / United States
60523Oak Brook, Illinois
ZIP code 60523 is a United States postal code for Oak Brook, Illinois. Its county association is DuPage County. The map reference point is at 41.8371, -87.9638.
- State / territory
- Illinois
- Recorded place name
- Oak Brook
- County association
- DuPage
- Estimated coordinate
- 41.8371, -87.9638
View on OpenStreetMap - ZIP prefix
- 605 · 65 ZIP codes share it
- Data source
- GeoNames postal reference, snapshot September 26, 2026
GeoNames reference data. County associations may not include every intersecting county, place names are postal names rather than legal boundaries, and coordinates are approximate. This is not address validation.
Area
- Land area
- 8.954 sq mi (2023 Census Gazetteer)
Figures are for the ZIP Code Tabulation Area (ZCTA) that most closely matches this ZIP code, not an exact match to USPS delivery boundaries. Source: U.S. Census Bureau, 2023 Gazetteer + 2023 ACS 5-Year Estimates, retrieved 2026-09-27. How to read this data.
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Browse the other 1,574 ZIP codes recorded for Illinois, sorted by code with place and county.
Illinois directoryNearby ZIP code reference points
| ZIP code | Place | State | County association | Miles |
|---|---|---|---|---|
| 60514 | Clarendon Hills | IL | DuPage | 2.8 |
| 60181 | Villa Park | IL | DuPage | 3.0 |
| 60521 | Hinsdale | IL | DuPage | 3.1 |
| 60515 | Downers Grove | IL | DuPage | 3.5 |
| 60148 | Lombard | IL | DuPage | 3.6 |
| 60558 | Western Springs | IL | Cook | 4.0 |
| 60126 | Elmhurst | IL | DuPage | 4.0 |
| 60162 | Hillside | IL | Cook | 4.0 |
Straight-line distance between reference points. Nearby points do not prove that ZIP areas touch.
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