ZIP code 60523: Oak Brook, IL
ZIP code 60523 is in Oak Brook (78% of residents) and Westmont (7.0%), in DuPage County (100%) and Cook County (0.2%), Illinois. 14% of its residents live outside city limits. It is in Illinois's 6th congressional district (60%), Illinois's 4th congressional district (40%) and Illinois's 7th congressional district (0.2%). Its state senate districts are State Senate District 23 (76%) and State Senate District 4 (24%); its state house districts are State House District 45 (72%), State House District 7 (24%) and State House District 46 (4.8%).
See it on the mapAll of Illinois
City and county
| City or town | Share of ZIP residents |
|---|---|
| Oak Brook | 78% |
| Westmont | 7.0% |
| Oakbrook Terrace | 0.2% |
| County | Share of ZIP residents |
|---|---|
| DuPage County | 100% |
| Cook County | 0.2% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| York township | 99% |
| Downers Grove township | 0.6% |
| Proviso township | 0.2% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Illinois's 6th congressional district (IL-06) | 60% |
| Illinois's 4th congressional district (IL-04) | 40% |
| Illinois's 7th congressional district (IL-07) | 0.2% |
This ZIP is split between districts. A mailing address in it could be in either; the map or locate_point gives the district for an exact address.
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (IL-06) | Sean Casten (D) | 202-225-4561 | 60% |
| U.S. Representative (IL-04) | Jesús G. "Chuy" García (D) | 202-225-8203 | 40% |
| U.S. Representative (IL-07) | Danny K. Davis (D) | 202-225-5006 | 0.2% |
| U.S. Senator | Richard J. Durbin (D) | 202-224-2152 · contact form | statewide |
| U.S. Senator | Tammy Duckworth (D) | 202-224-2854 · contact form | statewide |
| State Senator (State Senate District 23) | Suzy Glowiak Hilton (Democratic) | 630-785-3177 | 76% |
| State Senator (State Senate District 4) | Kimberly Lightford (Democratic) | 708-632-4500 | 24% |
| State Representative (State House District 45) | Marti Deuter (Democratic) | 630-413-1080 | 72% |
| State Representative (State House District 7) | Chris Welch (Democratic) | 708-450-1000 | 24% |
| State Representative (State House District 46) | Diane Blair-Sherlock (Democratic) | 630-415-3520 | 4.8% |
Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- Oak Brook website: http://www.oak-brook.org/
- Oak Brook laws: search for the Oak Brook, Illinois code of ordinances
- Westmont website: http://www.westmont.il.gov/
- Westmont laws: search for the Westmont, Illinois code of ordinances
- DuPage County website: https://www.dupagecounty.gov/
- DuPage County laws: search for the DuPage County, Illinois code of ordinances
- Cook County website: https://www.cookcountyil.gov/
- Cook County laws: search for the Cook County, Illinois code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 23 | 76% |
| State Senate District 4 | 24% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 45 | 72% |
| State House District 7 | 24% |
| State House District 46 | 4.8% |
Voting precincts
14 voting precincts overlap ZIP 60523. Map them, with each precinct's share of the ZIP's residents.
Get this in your AI agent
Your agent can get these cities, counties, districts and precincts with their shares, and their GeoJSON boundaries, from Boundary Atlas. Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:zcta:60523")
ZIP 60523 here is the Census Bureau's ZIP Code Tabulation Area, which approximates the USPS ZIP Code; PO-box-only ZIPs have none. Districts are the maps in force for the November 3, 2026 election.