ZIP code 92078: San Marcos, CA
ZIP code 92078 is in San Marcos (90% of residents) and Lake San Marcos (10%), in San Diego County, California. It is in California's 48th congressional district (100%), California's 50th congressional district (0.1%) and California's 49th congressional district (<0.1%). Its state senate districts are State Senate District 40 (100%) and State Senate District 38 (0.5%); its state house district is Assembly District 76.
See it on the mapAll of California
City and county
| City or town | Share of ZIP residents |
|---|---|
| San Marcos | 90% |
| Lake San Marcos | 10% |
| Harmony Grove | 0.1% |
| County | Share of ZIP residents |
|---|---|
| San Diego County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Oceanside-Escondido CCD | 91% |
| San Diego CCD | 9.1% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| California's 48th congressional district (CA-48) | 100% |
| California's 50th congressional district (CA-50) | 0.1% |
| California's 49th congressional district (CA-49) | <0.1% |
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 | Rebecca Jones | 760-744-1050 | 90% |
| U.S. Representative (CA-48) | Darrell Issa (R) | 202-225-5672 | 100% |
| U.S. Representative (CA-50) | Scott H. Peters (D) | 202-225-0508 | 0.1% |
| U.S. Representative (CA-49) | Mike Levin (D) | 202-225-3906 | <0.1% |
| 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 40) | Brian Jones (R) | 760-796-4655 | 100% |
| State Senator (State Senate District 38) | Catherine Blakespear (Democratic) | 949-598-5850 | 0.5% |
| Assembly Member (Assembly District 76) | Darsh Patel (Democratic) | 858-675-0760 | 100% |
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
- San Marcos laws: search for the San Marcos, California code of ordinances
- Lake San Marcos laws: search for the Lake San Marcos, California code of ordinances
- San Diego County laws: search for the San Diego County, California code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 40 | 100% |
| State Senate District 38 | 0.5% |
| State house district | Share of ZIP residents |
|---|---|
| Assembly District 76 | 100% |
Voting precincts
41 voting precincts overlap ZIP 92078. 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:92078")
ZIP 92078 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.