ZIP code 91770: Rosemead, CA
ZIP code 91770 is in Rosemead (86% of residents) and South San Gabriel (13%), in Los Angeles County, California. It is in California's 28th congressional district (99%) and California's 38th congressional district (0.9%). Its state senate districts are State Senate District 25 (99%) and State Senate District 22 (0.9%); its state house district is Assembly District 49.
See it on the mapAll of California
City and county
| City or town | Share of ZIP residents |
|---|---|
| Rosemead | 86% |
| South San Gabriel | 13% |
| County | Share of ZIP residents |
|---|---|
| Los Angeles County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Southwest San Gabriel Valley CCD | 100% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| California's 28th congressional district (CA-28) | 99% |
| California's 38th congressional district (CA-38) | 0.9% |
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 (CA-28) | Judy Chu (D) | 202-225-5464 | 99% |
| U.S. Representative (CA-38) | Linda T. Sánchez (D) | 202-225-6676 | 0.9% |
| 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 | 99% |
| State Senator (State Senate District 22) | Susan Rubio (Democratic) | 909-460-6064 | 0.9% |
| State Senator (State Senate District 30) | Bob Archuleta (Democratic) | 562-406-1001 | <0.1% |
| Assembly Member (Assembly District 49) | Mike Fong (Democratic) | 626-457-4918 | 100% |
| Assembly Member (Assembly District 54) | Mark González (Democratic) | 213-620-4646 | <0.1% |
| Assembly Member (Assembly District 56) | Lisa Calderon (Democratic) | 562-692-5858 | <0.1% |
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: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- Rosemead website: http://www.cityofrosemead.org
- Rosemead laws: search for the Rosemead, California code of ordinances
- South San Gabriel laws: search for the South San Gabriel, California code of ordinances
- Los Angeles County website: https://lacounty.gov
- Los Angeles County laws: search for the Los Angeles County, California code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 25 | 99% |
| State Senate District 22 | 0.9% |
| State Senate District 30 | land only |
| State house district | Share of ZIP residents |
|---|---|
| Assembly District 49 | 100% |
| Assembly District 54 | land only |
| Assembly District 56 | land only |
Voting precincts
18 voting precincts overlap ZIP 91770. 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:91770")
ZIP 91770 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.