Lake San Marcos, San Marcos: Homes for Sale & Neighborhood Guide
An unincorporated lakeside community surrounded by the City of San Marcos.
Lake San Marcos is an unincorporated community (census-designated place) surrounded by the City of San Marcos, in ZIP 92078. It had 5,328 residents at the 2020 census. It is governed by San Diego County and receives some services from the city. In September 2026 the 92078 median detached sale was $1,375,000 (GSDAR). Market figures here are for all of 92078. Lake San Marcos has about 1,140 detached homes and 670 attached homes such as condos, townhomes and apartments (U.S. Census ACS 2020–2024).
Boundary: approximate neighborhood outline by Jamile Storck and Jed Bratt. Map tiles © Esri, HERE, Garmin, USGS, NGA, EPA, USDA, NPS, © OpenStreetMap contributors.
Lake San Marcos Market · September 2026
ZIP 92078 · compared with September 2025
Source: Greater San Diego Association of REALTORS® Local Market Update for 92078 (San Marcos South), September 2026 (current as of Oct 5, 2026). Sept 2025 figures are as shown in the same report. All data from the San Diego MLS. Medians do not account for sale concessions. Small sample sizes can swing percentages.
Homes for Sale In and Near Lake San Marcos
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Living in Lake San Marcos
The vibe
Lake San Marcos grew up as a resort community around its lake, which was created by a concrete dam built between 1946 and 1951 for irrigation and cattle. Today the lake is used mainly for recreation.
Source: Wikipedia, Lake San Marcos, California.
Things to do
The lake covers about 0.1 square miles of the community’s 1.8 square miles, and homes ring its shore.
Source: Wikipedia, Lake San Marcos, California.
Schools
La Costa Meadows Elementary
Grades K-5
San Marcos Middle
Grades 6-8
San Marcos High
Grades 9-12
Ratings out of 10: ELA and math = % of students meeting or exceeding the 2025 CAASPP standard, divided by 10; overall = average of the two. Source: California Dept. of Education (caaspp-elpac.ets.org). School assignment changes, so confirm with the district before you buy.
Getting around
Rancho Santa Fe Road and San Marcos Boulevard run near the community and connect to SR-78.
Source: Wikipedia, San Marcos, California.
Neighborhood Insight
The area was once part of Rancho Los Vallecitos de San Marcos, an 8,877-acre Mexican land grant from 1840. Questions about a property? text Jamile or Jed.
Source: Wikipedia, Lake San Marcos, California.
Around Lake San Marcos
Lake San Marcos FAQ
Where is Lake San Marcos?
Lake San Marcos is in the southwest part of San Marcos, in ZIP 92078, surrounded by the city.
What was the median home price in Lake San Marcos in September 2026?
For ZIP 92078, the September 2026 median sale price was $1,375,000 for detached homes and $699,000 for attached homes (GSDAR Local Market Update). These are ZIP-wide figures for 92078, which covers south San Marcos.
How long are Lake San Marcos homes taking to sell?
In September 2026, detached homes in 92078 sold in a median of 44 days and attached homes in 57 days (GSDAR).
Is Lake San Marcos part of the City of San Marcos?
No. It is an unincorporated county island inside the city, though it receives some services from the city.
Which schools serve Lake San Marcos?
San Marcos Unified runs La Costa Meadows Elementary, San Marcos Middle and San Marcos High in and near the area. Check your exact address with the district.
Who can help me buy or sell a home in Lake San Marcos?
Jamile Storck (DRE 01920597) and Jed Bratt (DRE 01891062) help buyers and sellers in Lake San Marcos and across San Marcos.
Neighborhoods Nearby
Twelve neighborhoods closest to Lake San Marcos, with Sept 2026 median sale prices by ZIP from GSDAR.
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