Lake San Marcos, CA Profile: Facts, Map & Data


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Lake San Marcos, California - Basic Facts

The Lake San Marcos Census Designated Place had a population of 4,926 as of July 1, 2017.

The primary coordinate point for Lake San Marcos is located at latitude 33.1224 and longitude -117.2086 in San Diego County. The formal boundaries for the Lake San Marcos Census Designated Place (see map below) encompass a land area of 1.72 sq. miles and a water area of 0.09 sq. miles. San Diego County is in the Pacific time zone (GMT -8). The elevation is 525 feet.

The Lake San Marcos Census Designated Place (GNIS ID: 2408550) has a U1 Census Class Code which indicates a census designated place with an official federally recognized name. It also has a Functional Status Code of "S" which identifies a statistical entity.

California is one of 20 states where Census County Divisions (CCDs) are used for statistical tracking of subdivisions within each county. The Lake San Marcos Census Designated Place is located within Oceanside-Escondido CCD of San Diego County.

Beneath the boundary map are tables with Lake San Marcos population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

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Lake San Marcos Census Designated Place, CA Boundary Map

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Boundary Maps: Oceanside-Escondido CCD | San Diego County | California Counties

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Lake San Marcos, CA Data & Demographics (As of July 1, 2017)


Total Population 4,926
Daytime Population: Workers 477
Daytime Population: Residents 3,026
Total Daytime Population (TDP) 3,503
Ratio TDP/Total Population1 0.71
Population in Households 4,924
Population in Familes 3,748
Population in Group Qrtrs 2
Population Density2 2,863
Diversity Index3 51


Median Household Income $50,628
Average Household Income $76,657
Per Capita Income $33,554


Total Housing Units 2,593 (100%)
Owner Occupied HU 1,823 (70.3%)
Renter Occupied HU 682 (26.3%)
Vacant Housing Units 88 ( 3.4%)
Median Home Value $499,622
Average Home Value $528,062


Total Households 2,505
Average Household Size 1.97
Family Households 1,527
Average Family Size 2
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 1.45% 1.87%
Households 1.02% 1.76%
Families 2.26% 1.81%
Median Household Income   1.4%
Per Capita Income   2.32%

Lake San Marcos, CA - Peer Comparisons by Rank and Percentile

The table below compares Lake San Marcos to the other 1,516 incorporated cities, towns and CDPs in California by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 651 57th
Population Density # 487 68th
Diversity Index # 975 36th
Median Household Income # 927 39th
Per Capita Income # 566 63rd

Additional comparisons and rankings can be made with a VERY EASY TO USE California Census Data Comparison Tool.

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