ZIP code 90720: Los Alamitos, CA
ZIP code 90720 is in Los Alamitos (51% of residents), Rossmoor (46%) and Cypress (2.4%), in Orange County, California. It is in California's 41st congressional district (94%) and California's 45th congressional district (6.3%). Its state senate district is State Senate District 36; its state house districts are Assembly District 70 (98%) and Assembly District 67 (2.4%).
See it on the mapAll of California
City and county
| City or town | Share of ZIP residents |
|---|---|
| Los Alamitos | 51% |
| Rossmoor | 46% |
| Cypress | 2.4% |
| County | Share of ZIP residents |
|---|---|
| Orange County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Anaheim-Santa Ana-Garden Grove CCD | 100% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| California's 41st congressional district (CA-41) | 94% |
| California's 45th congressional district (CA-45) | 6.3% |
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-41) | Ken Calvert (R) | 202-225-1986 | 94% |
| U.S. Representative (CA-45) | Derek Tran (D) | 202-225-2415 | 6.3% |
| 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 36) | Tony Strickland (R) | 714-374-4000 | 100% |
| Assembly Member (Assembly District 70) | Tri Ta (R) | 714-379-0970 | 98% |
| Assembly Member (Assembly District 67) | Sharon Quirk-Silva (Democratic) | 714-521-6713 | 2.4% |
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
- Los Alamitos website: https://cityoflosalamitos.org/
- Los Alamitos laws: search for the Los Alamitos, California code of ordinances
- Rossmoor laws: search for the Rossmoor, California code of ordinances
- Cypress laws: search for the Cypress, California code of ordinances
- Orange County website: https://ocgov.com/
- Orange County laws: search for the Orange County, California code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 36 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| Assembly District 70 | 98% |
| Assembly District 67 | 2.4% |
Voting precincts
27 voting precincts overlap ZIP 90720. 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:90720")
ZIP 90720 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.