Residential delivery area · California
ZIP Code 91978: Spring Valley, CA
ZIP code 91978 uses the postal name Spring Valley, California and lies entirely in San Diego County (Census 2020 ZIP-county file). About 10,000 people live there (Census Bureau, ACS 2020-2024), the less populous of Spring Valley's 2 residential ZIP codes. Median household income is $113,170 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Spring Valley (31%) and Jamul (11%); 59% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Spring Valley · 2 residential ZIPs
- County
- San Diego County
- Census places
- Spring Valley (31%) census-designated place; Jamul (11%) census-designated place
- Metro area
- San Diego-Chula Vista-Carlsbad, CA
- House districts
- CA-48 (69%), CA-51 (31%) 119th Congress, by share of land
- State
- California
- Time zone
- Pacific
- Land area
- 11.9 sq mi · 839 people per sq mi
Where is ZIP code 91978?
91978 centers on 32.699°, -116.931° and covers 11.9 square miles of land plus 0.0 of water. It borders 6 ZIP codes: 91914, 91977, 91902, 91941, 92019, 91935.
The map draws ZIP code areas only. For the streets inside 91978, 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).
How does 91978 compare with the rest of Spring Valley?
| Measure | 91978 | In Spring Valley | In San Diego County | In CA |
|---|---|---|---|---|
| People (ACS 2020-2024) | 10,014 | 2nd of 2 | 79th of 116 | 1,006th of 1,802 |
| Median household income | $113k | 1st of 2 | 38th of 85 | 427th of 1,189 |
| Median home value | $637k | 2nd of 2 | 76th of 89 | 756th of 1,317 |
Its median household income is higher than in 88% of U.S. residential ZIP codes, and it is denser than 77% 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 91978?
The 2020 Census counted 9,949 people in 91978; the ACS, which samples households over 2020-2024, estimates 10,014. Its boundary changed between the 2010 and 2020 censuses, so the two counts are not compared.
- People, ACS 2020-2024
- 10,014±1,084 (90% margin)
- 2020 Census count
- 9,949
- Households
- 3,236
- Median age
- 42.5
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 91978?
Of the 10,014 people the ACS estimates in 91978, 20.3% are under 18 and 18.5% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (41.5%), then Hispanic or Latino (34.1%).
- Under 1820.3%
- 18 to 6461.1%
- 65 and older18.5%
- White, not Hispanic41.5%
- Hispanic or Latino34.1%
- Black, not Hispanic10.2%
- Other or two or more7.7%
- Asian, not Hispanic6.5%
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 91978 earn?
Median household income is $113,170 (ACS 2020-2024), the 38th highest of the 85 ranked ZIP codes in San Diego County.
- Median household income
- $113,170±$11,519
- Income per person
- $44,103
- Below the poverty line
- 10.2%
- Unemployed (of the labor force)
- 9.3%
- Adults 25+ with a bachelor's degree
- 31.3%
- Adjusted gross income per tax return, 2022
- $72,7614,930 returns; wages 73% 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 91978?
FHFA's house price index for 91978, built from repeat sales and appraisals of the same homes, rose 116% from 2015 to 2025 and rose 64% from 2020 to 2025, and moved +16.2% in 2025.
- Median home value (owners' estimate)
- $637,200
- Median gross rent
- $2,327
- Homes owned by their occupants
- 67.9%
- Housing units
- 3,311
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 91978?
183 business establishments had a location in this ZIP code in 2023, 11 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction37
- Professional, scientific, and technical services20
- Manufacturing16
- Wholesale trade16
- Health care and social assistance16
- Retail trade15
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 91978?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 91914 | Chula Vista | 16,877 | $191k | 2.6 mi |
| 91977 | Spring Valley | 61,064 | $100k | 4.1 mi |
| 91902 | Bonita | 17,698 | $123k | 4.7 mi |
| 91941 | La Mesa | 33,218 | $115k | 5.7 mi |
| 92019 | El Cajon | 45,351 | $102k | 6.5 mi |
| 91935 | Jamul | 9,114 | $152k | 9.0 mi |
| 91915 | Chula Vista | 35,322 | $140k | 5.3 mi (near) |
| 91913 | Chula Vista | 57,721 | $129k | 6.2 mi (near) |
| 91945 | Lemon Grove | 27,745 | $88k | 6.4 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.