Residential delivery area · California
ZIP Code 92078: San Marcos, CA
ZIP code 92078 is in San Marcos, California, entirely in San Diego County (Census 2020 ZIP-county file). About 54,000 people live there (Census Bureau, ACS 2020-2024), the most populous of San Marcos's 3 residential ZIP codes. Median household income is $120,268 (Census Bureau, ACS 2020-2024). By Census place, its land lies in San Marcos (79%), Lake San Marcos (10%) and Harmony Grove (6%); 5% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- San Marcos · 3 residential ZIPs
- County
- San Diego County
- Census places
- San Marcos (79%); Lake San Marcos (10%) census-designated place; Harmony Grove (6%) census-designated place
- Neighborhoods
- Casitas del Sol Mobile Home Park, LaMoree Mobile Estates, Palomar East Mobile Home Park, Palomar West Mobile Home Park, San Marcos Mobile Estates GeoNames
- Metro area
- San Diego-Chula Vista-Carlsbad, CA
- House districts
- CA-50 (98%), CA-49 (2%) 119th Congress, by share of land
- State
- California
- Time zone
- Pacific
- Land area
- 16.7 sq mi · 3,210 people per sq mi
- PO Box ZIPs
- 92079 also use the name San Marcos
Where is ZIP code 92078?
92078 centers on 33.117°, -117.181° and covers 16.7 square miles of land plus 0.1 of water. It borders 6 ZIP codes: 92096, 92029, 92009, 92069, 92081, 92024.
The map draws ZIP code areas only. For the streets inside 92078, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0); neighborhoods from the GeoNames gazetteer (CC BY 4.0), placed in this ZIP code by PlainZIP.
How does 92078 compare with the rest of San Marcos?
| Measure | 92078 | In San Marcos | In San Diego County | In CA |
|---|---|---|---|---|
| People (ACS 2020-2024) | 53,605 | 1st of 3 | 19th of 116 | 184th of 1,802 |
| Median household income | $120k | 1st of 2 | 30th of 85 | 354th of 1,189 |
| Median home value | $942k | 1st of 2 | 29th of 89 | 394th of 1,317 |
Its median household income is higher than in 90% of U.S. residential ZIP codes, and it is denser than 89% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 92078?
The 2020 Census counted 52,347 people in 92078; the ACS, which samples households over 2020-2024, estimates 53,605. Between the 2010 and 2020 censuses its population grew 22.0% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 53,605
- 2020 Census count
- 52,347+22.0% since 2010 (42,906)
- Households
- 18,522
- Median age
- 38.8
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 92078?
Of the 53,605 people the ACS estimates in 92078, 24.7% are under 18 and 17.0% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (51.8%), then Hispanic or Latino (27.7%).
- Under 1824.7%
- 18 to 6458.2%
- 65 and older17.0%
- White, not Hispanic51.8%
- Hispanic or Latino27.7%
- Asian, not Hispanic11.9%
- Other or two or more7.6%
- Black, not Hispanic1.0%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 92078 earn?
Median household income is $120,268 (ACS 2020-2024), the 30th highest of the 85 ranked ZIP codes in San Diego County. It rose from $104,705 in 2015-2019 (in 2024 dollars), a change larger than the surveys' margins of error.
- Median household income
- $120,268
- Income per person
- $54,529
- Below the poverty line
- 7.0%
- Unemployed (of the labor force)
- 4.4%
- Adults 25+ with a bachelor's degree
- 49.2%
- Adjusted gross income per tax return, 2022
- $125,91522,800 returns; wages 72% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 92078?
FHFA's house price index for 92078, built from repeat sales and appraisals of the same homes, rose 93% from 2015 to 2025 and rose 53% from 2020 to 2025, and moved −6.7% in 2025.
- Median home value (owners' estimate)
- $942,300
- Median gross rent
- $2,567
- Homes owned by their occupants
- 72.0%
- Housing units
- 19,339
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 92078?
1,458 business establishments had a location in this ZIP code in 2023, 227 more than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services220
- Health care and social assistance190
- Retail trade147
- Other services (except public administration)139
- Accommodation and food services136
- Construction122
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 92078?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 92096 | San Marcos | 0 | – | 1.6 mi |
| 92029 | Escondido | 20,726 | $125k | 3.9 mi |
| 92009 | Carlsbad | 44,739 | $164k | 4.0 mi |
| 92069 | San Marcos | 47,335 | $97k | 4.2 mi |
| 92081 | Vista | 29,002 | $105k | 4.8 mi |
| 92024 | Encinitas | 50,617 | $159k | 6.1 mi |
| 92091 | Rancho Santa Fe | 972 | $104k | 4.5 mi (near) |
| 92067 | Rancho Santa Fe | 7,938 | $187k | 6.7 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.