ZIP Code 91978, California
ZIP Code 91978 profile, demographic data, and geographic information.
ZCTA5 91978 is a 5-digit ZIP Code area located in San Diego County, California. As of official census estimates, it has a reported population of 10,014. The land area covers 11.94 sq mi. [1]
Demographics & Population
| Demographic Metric | Estimate / Count | Margin of Error | Survey Period / Source |
|---|---|---|---|
| Total Population | 10,014 | ±1,084 | 2020-2024 / Census ACS 5-Year 2024 |
| Median Age | 42.5 yrs | ±4 | 2020-2024 / Census ACS 5-Year 2024 |
| Total Households | 3,236 | ±279 | 2020-2024 / Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).
Housing & Real Estate Profile
| Housing Metric | Estimate / Value | Margin of Error |
|---|---|---|
| Total Housing Units | 3,311 | ±276 |
| Occupied Housing Units | 3,236 | ±279 |
| Vacant Housing Units | 75 | ±84 |
| Median Home Value | $637,200 | ±$80,393 |
| Median Gross Rent | $2,327 | ±$246 |
Source: U.S. Census Bureau ACS 5-Year (2020-2024).
Economy & Workforce
| Economic Metric | Estimate / Value | Margin of Error |
|---|---|---|
| Median Household Income | $113,170 | ±$11,519 |
| Per Capita Income | $44,103 | ±$4,413 |
| Poverty Rate | 10.2% | ±5.4% |
| Population Below Poverty Level | 1,016 | ±551 |
| Unemployment Rate | 9.3% | ±4.1% |
| Civilian Labor Force, Employed | 4,822 | ±783 |
| Broadband Internet Rate | 92.2% | ±3.2% |
Source: U.S. Census Bureau ACS 5-Year (2020-2024).
Local Government & Public Administration
Authoritative general-purpose local government units serving this area
U.S. Census Bureau GUS (2026) / GMAF
| Government Unit | Unit Type | Jurisdiction Role | Contact / Address |
|---|---|---|---|
|
GUS Population: 3,298,799 (2024)
ID: 161111
|
County | Official County Government |
Contact: HUMAN RESOURCES
5530 OVERLAND AVE, STE 210, SAN DIEGO CA 92123-1204
|
Education
Listing 10 local institutions (NCES 2024-2025)
External reference via K12Guides
| Institution | Type | Grades | Location |
|---|---|---|---|
| Alternative School Nearby | 01-12 | San Diego, CA | |
| Regular School Nearby | KG-05 | San Diego, CA | |
| Regular School Nearby | KG-08 | San Diego, CA | |
| Regular School Nearby | KG-06 | Bonita, CA | |
| Alternative School Nearby | 07-12 | Chula Vista, CA | |
| Regular School Nearby | KG-12 | San Diego, CA | |
| Regular School Nearby | 06-12 | San Diego, CA | |
| Regular School Nearby | 07-12 | El Cajon, CA | |
| Regular School Nearby | 07-12 | Chula Vista, CA | |
| Regular School Nearby | KG-12 | San Diego, CA |
Source: k12guides.com.
Community Facilities & Infrastructure
Displaying 10 civic institutions across 2 datasets queried
CMS • IPEDS • IMLS
| Facility Name | Category | Relationship | Address / Location | Contact |
|---|---|---|---|---|
|
Cuyamaca College
|
College | 2.9 mi away | 900 Rancho San Diego Pky, El Cajon, CA, 92019 |
6196604000
|
|
RANCHO SAN DIEGO LIBRARY
|
Library | 3.2 mi away | 11555 VIA RANCHO SAN DIEGO, EL CAJON, CA, 92019 |
(619) 660-5370
|
|
Southwestern College
|
College | 5.6 mi away | 900 Otay Lakes Rd., Chula Vista, CA, 91910-7299 |
6194216700
|
|
SPRING VALLEY LIBRARY
|
Library | 3.9 mi away | 836 KEMPTON STREET, SPRING VALLEY, CA, 91977 |
(619) 463-3006
|
|
Bellus Academy-El Cajon
|
College | 6.3 mi away | 1073 E Main St, El Cajon, CA, 92021 |
6194423407
|
|
CASA DE ORO LIBRARY
|
Library | 4.3 mi away | 9805 CAMPO RD. #180, SPRING VALLEY, CA, 91977 |
(619) 463-3236
|
|
California Hair Design Academy
|
College Vocational | 6.7 mi away | 8011 University Avenue, Suite A-2, La Mesa, CA, 91942-5055 |
6194618600
|
|
SKYLINE HILLS BRANCH LIBRARY
|
Library | 5.3 mi away | 7900 PARADISE VALLEY ROAD, SAN DIEGO, CA, 92139 |
(619) 527-3485
|
|
Southern California Seminary
|
College | 6.9 mi away | 2075 E. Madison Avenue, El Cajon, CA, 92019-1108 |
6192018999
|
|
LEMON GROVE LIBRARY
|
Library | 6.0 mi away | 3001 SCHOOL LANE, LEMON GROVE, CA, 91945 |
(619) 463-9819
|
Distances calculated from authoritative source coordinates. Source: CMS, IMLS, NCES IPEDS.
Climate & Weather Observations
NOAA Monthly Climate Normals
Observation Station: Climate data reflects NOAA 1991–2020 standard normals recorded at EL CAJON, CA US, located 6.8 miles from ZCTA5 91978. Local microclimates, topography, and elevation may cause municipal conditions to differ.
| Month | High (°F) | Low (°F) | Mean (°F) | Precip (in) | Snow (in) |
|---|---|---|---|---|---|
| January | 69.3° | 42.5° | 55.9° | 2.32" | 0.0" |
| February | 69.2° | 44.4° | 56.8° | 2.61" | 0.0" |
| March | 71.3° | 48.0° | 59.7° | 1.92" | 0.0" |
| April | 74.5° | 50.7° | 62.6° | 0.75" | 0.0" |
| May | 76.2° | 55.9° | 66.1° | 0.30" | 0.0" |
| June | 80.8° | 59.4° | 70.1° | 0.06" | 0.0" |
| July | 86.1° | 63.3° | 74.7° | 0.16" | 0.0" |
| August | 88.6° | 64.7° | 76.6° | 0.02" | 0.0" |
| September | 87.3° | 62.1° | 74.7° | 0.11" | 0.0" |
| October | 81.0° | 55.6° | 68.3° | 0.54" | 0.0" |
| November | 75.2° | 47.1° | 61.2° | 1.01" | 0.0" |
| December | 68.5° | 41.7° | 55.1° | 1.83" | 0.0" |
Source: NOAA U.S. Climate Normals (1991–2020).
Local Weather Forecast
Weather forecast data is currently unavailable in the local cache.
Nearby Cities & Communities
Listing adjacent communities by spatial proximity (miles)
Proximity discovery
| Community Name | Classification | Distance | Population |
|---|---|---|---|
| Spring Valley CDP | CDP | 3.0 mi | — |
| Jamul CDP | CDP | 3.9 mi | — |
| La Presa CDP | CDP | 4.0 mi | — |
| Rancho San Diego CDP | CDP | 4.2 mi | — |
| Bonita CDP | CDP | 4.5 mi | — |
| Casa de Oro-Mount Helix CDP | CDP | 4.6 mi | — |
Sources & Data Provenance
- Geographic Classification & Identifiers: U.S. Census Bureau Gazetteer (2026) and TIGER/Line Shapefiles. GEOID: 91978. • Official Source Dataset →
- Socioeconomic & Housing Metrics: U.S. Census Bureau American Community Survey (ACS) 5-year estimates and Population Estimates Program (PEP). Margin of Error (MOE) intervals are reported where published; suppressed values are never estimated or replaced with false zeros.
- Civic Directory Datasets: Centers for Medicare & Medicaid Services (CMS Hospital Directory), National Center for Education Statistics (NCES IPEDS Postsecondary Directory), and Institute of Museum and Library Services (IMLS Public Libraries Survey). Airport landing facilities are provided by airport-data.com.
- Weather & Climate Observations: National Oceanic and Atmospheric Administration (NOAA) U.S. Climate Normals 1991–2020 and National Weather Service (NWS) point forecasts.