Zip Code 92078
San Marcos, California — San Diego County
📍 ZIP code 92078 is in San Marcos, San Diego County, California.
ZIP code 92078 is located in San Marcos, San Diego County, California. It is a zip code in the Pacific (PST/PDT) Time Zone with an estimated population of 53,542. The area code for ZIP code 92078 is 619.
Quick Answer
Zip code 92078 is in San Marcos, California (San Diego County). It has a population of 53,542, median household income of $114,905, and median home value of $874,000.
Population
53,542
Income
$114,905
Home Value
$874,000
Climate
87°F / 45°F
About Zip Code 92078
Zip code 92078 is located in San Marcos, California, within San Diego County. Home to approximately 53,542 residents, this area sits at an elevation of 1040 ft and falls within the Pacific (PST/PDT) timezone. The local area code is 619.
The median household income is $114,905 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $874,000, and the cost of living index is 226 (126% above the national average of 100).
Summers average a high of 87°F while winters drop to 45°F. The area receives about 15 in of rain annually. The zip code covers 16.7 square miles of land area and 0.1 square miles of water.
Key Statistics
53,542
$114,905
$874,000
Pacific (PST/PDT)
619
1040 ft
16.7 sq mi
38.6
19,249
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Compare With Nearby Zip Codes
| Metric | 92078 | 92029 | 92069 | 92009 | 92025 | 92024 |
|---|---|---|---|---|---|---|
| City | San Marcos, CA | Escondido, CA | San Marcos, CA | Carlsbad, CA | Escondido, CA | Encinitas, CA |
| Population | 53,542 | 20,296 | 46,825 | 45,778 | 50,046 | 50,030 |
| Median Income | $114,905 | $120,038 | $93,065 | $162,128 | $71,716 | $149,080 |
| Home Value | $874,000 | $911,600 | $714,700 | $1,219,600 | $767,400 | $1,409,700 |
| Cost of Living | 226 | 241 | 187 | 250 | 187 | 250 |
| Median Age | 38.6 | 43.9 | 36.5 | 43.3 | 36.8 | 44.3 |
Cost of Living
100 = National Average. San Marcos's cost of living is 126% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
7.6x
Demographics
Zip code 92078 has a population of 53,542 people with a median age of 38.6. There are 19,249 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
San Marcos (92078) population trend from 2010 to 2024
↑ 92.7%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
87°F
45°F
15 in
0 in
San Marcos experiences warm summers with average highs around 87°F. Winters are mild with lows averaging 45°F. The area receives virtually no snowfall.
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Housing & Economy
Median Home Value
$874,000
Median Household Income
$114,905
With 19,249 housing units across 16.7 square miles, 92078 has a housing density of 1,153 units per square mile. The home price-to-income ratio is 7.6x.
Location & Geography
Latitude
33.1171°
Longitude
-117.1808°
Land Area
16.7 sq mi
Water Area
0.1 sq mi
Nearby Zip Codes
Zip codes closest to 92078 (San Marcos, CA) with distances:
All Zip Codes in San Marcos, CA
Other zip codes serving San Marcos:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 92078's $114,905. A way to compare San Marcos to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 92078 (San Marcos, CA). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is San Marcos, California?
San Marcos, California uses zip code 92078 along with 1 other zip codes.
What county is zip code 92078 in?
Zip code 92078 is located in San Diego County, California.
What is the population of zip code 92078?
The population of zip code 92078 is 53,542 with a median age of 38.6.
Is 92078 in San Marcos, California?
Yes, zip code 92078 is in San Marcos, San Diego County, California. The area code is 619.
Frequently Asked Questions
What city is zip code 92078 in?
Zip code 92078 is in San Marcos, California. It is part of San Diego County and uses the Pacific (PST/PDT) timezone.
What is zip code 92078?
Zip code 92078 is a U.S. postal code in San Marcos, California (San Diego County). It has a population of 53,542 and covers 16.7 square miles.
What is the population of zip code 92078?
The population of zip code 92078 (San Marcos, CA) is 53,542 with a median age of 38.6. There are approximately 19,249 housing units in this area.
What is the median income in zip code 92078?
The median household income in zip code 92078 (San Marcos, CA) is $114,905 per year. The cost of living index is 226 (100 = national average).
What is the average home price in zip code 92078?
The median home value in zip code 92078 (San Marcos, CA) is $874,000. The cost of living index is 226 compared to the national average of 100.
What county is zip code 92078 in?
Zip code 92078 is located in San Diego County, California. The primary city is San Marcos.
What is the area code for zip code 92078?
Zip code 92078 in San Marcos, CA uses area code 619. It is located in the Pacific (PST/PDT) timezone.
Is zip code 92078 a good place to live?
Zip code 92078 (San Marcos, CA) has a cost of living index of 226 (100 = national average), a median household income of $114,905, and median home values of $874,000. The median age is 38.6. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 92078?
The cost of living index for zip code 92078 (San Marcos, CA) is 226, where 100 represents the national average. This area is above the national average. Median home value: $874,000.
What schools serve zip code 92078?
Zip code 92078 in San Marcos, California is served by the local school district of San Diego County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.