ZIP code 91737: Rancho Cucamonga, CA
ZIP code 91737 is in Rancho Cucamonga, in San Bernardino County, California. It is in California's 28th congressional district (73%) and California's 33rd congressional district (27%). Its state senate districts are State Senate District 25 (87%) and State Senate District 29 (13%); its state house districts are Assembly District 41 (87%) and Assembly District 50 (13%).
See it on the mapAll of California
City and county
| City or town | Share of ZIP residents |
|---|---|
| Rancho Cucamonga | 100% |
| County | Share of ZIP residents |
|---|---|
| San Bernardino County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Ontario CCD | 100% |
| Mount Baldy-Wrightwood CCD | 0.2% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| California's 28th congressional district (CA-28) | 73% |
| California's 33rd congressional district (CA-33) | 27% |
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 |
|---|---|---|---|
| Mayor | L. Dennis Michael | 909-477-2700 | 100% |
| U.S. Representative (CA-28) | Judy Chu (D) | 202-225-5464 | 73% |
| U.S. Representative (CA-33) | Pete Aguilar (D) | 202-225-3201 | 27% |
| U.S. Senator | Adam B. Schiff (D) | 202-224-3841 | statewide |
| U.S. Senator | Alex Padilla (D) | 202-224-3553 · contact form | statewide |
| State Senator (State Senate District 25) | Sasha Pérez (Democratic) | 818-409-0402 | 87% |
| State Senator (State Senate District 29) | Eloise Reyes (Democratic) | 909-888-5360 | 13% |
| Assembly Member (Assembly District 41) | John Harabedian (Democratic) | 626-351-1917 | 87% |
| Assembly Member (Assembly District 50) | Robert Garcia (Democratic) | 909-966-5090 | 13% |
Elected in 2024 under CA's previous congressional map; this district's lines changed for the 120th Congress (seated January 3, 2027).
Officials serving now (members of Congress until January 3, 2027). Sources: Mayors: Open States (public domain); State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- Rancho Cucamonga website: http://www.CityofRC.us
- Rancho Cucamonga council: Rancho Cucamonga City Council
- Rancho Cucamonga laws: search for the Rancho Cucamonga, California code of ordinances
- San Bernardino County website: https://main.sbcounty.gov/
- San Bernardino County laws: search for the San Bernardino County, California code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 25 | 87% |
| State Senate District 29 | 13% |
| State house district | Share of ZIP residents |
|---|---|
| Assembly District 41 | 87% |
| Assembly District 50 | 13% |
Voting precincts
25 voting precincts overlap ZIP 91737. 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:91737")
ZIP 91737 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.