Lake San Marcos, California
Lake San Marcos is a Census-designated place (an unincorporated community) in San Diego County, California, with 5,328 residents in 2020. It is in California's 48th congressional district. It spans 2 state senate districts. Its state house district is Assembly District 76.
County
| County | Share of residents |
|---|---|
| San Diego County | 100% |
Congressional district
| Congressional district | Share of residents |
|---|---|
| California's 48th congressional district (CA-48) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (CA-48) | Darrell Issa (R) | 202-225-5672 | 100% |
| 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 | 96% |
| State Senator (State Senate District 38) | Catherine Blakespear (Democratic) | 949-598-5850 | 3.9% |
| 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: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- 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 residents |
|---|---|
| State Senate District 40 | 96% |
| State Senate District 38 | 3.9% |
| State house district | Share of residents |
|---|---|
| Assembly District 76 | 100% |
ZIP codes
Percentages mark ZIPs only partly in Lake San Marcos: the share of that ZIP's residents living in it.
- 92078 (10%)
Get this in your AI agent
Your agent can get Lake San Marcos's counties and districts with shares, its ZIP codes (level='zcta'), and its boundary as GeoJSON (get_boundaries). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:place:0639724")
Lake San Marcos here is the Census Bureau's place boundary as of January 1, 2025 (a Census-designated place, which has no municipal government). Shares are of 2020 Census population. Districts are the maps in force for the November 3, 2026 election.