91978 ZIP Code, Spring Valley, CA
91978 is a ZIP code in Spring Valley, California in San Diego County. It covers 12 square miles of land. The closest ZIP codes are 91914, 91977 and 91902. 10,014 people live here in 3,236 households. With about 839 people per square mile it is lightly settled, and owners and renters are mixed (68% own). Median household income is $113,170, above the California median of $99,122.
Quick facts
- Mailing city: Spring Valley, CA
- County: San Diego County
- Land area: 12 sq mi
- Population: 10,014
- Median household income: $113,170
- Carrier routes: 6 (3,506 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 10,014 |
| Households | 3,236 |
| Median household income | $113,170 |
| Income per person | $44,103 |
| Median age | 42.5 |
| Homeowners | 67.9% |
| Median home value | $637,200 |
| Median rent | $2,327 |
| Bachelor's degree or higher | 31.3% |
| Average commute (minutes) | 26.7 |
| Households with kids under 18 | 33.5% |
| Moved in the past year | 4.8% |
| Below the poverty line | 10.2% |
| Broadband internet | 92.2% |
| Speak a non-English language at home | 41.5% |
Household income
| % of households | Value |
|---|---|
| <$10K | 1.5% |
| $10–15K | 0.3% |
| $15–25K | 7.5% |
| $25–35K | 3.3% |
| $35–50K | 7.0% |
| $50–75K | 12.2% |
| $75–100K | 11.2% |
| $100–150K | 25.0% |
| $150–200K | 13.7% |
| $200K+ | 18.3% |
Age
| % of all residents | Value |
|---|---|
| <10 | 8.9% |
| 10–19 | 13.9% |
| 20–24 | 4.3% |
| 25–34 | 13.0% |
| 35–44 | 13.9% |
| 45–54 | 15.4% |
| 55–64 | 12.1% |
| 65–74 | 10.1% |
| 75+ | 8.4% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 39.7% |
| Owned outright | 26.9% |
| Rented | 31.2% |
| Vacant | 2.3% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 52.3% |
| Townhome | 2.8% |
| 2–4 units | 4.6% |
| 5–19 units | 15.3% |
| 20+ units | 4.7% |
| Mobile / other | 20.3% |
Businesses in 91978
183 business establishments with 1,678 employees (ZIP Codes Business Patterns 2023).
- Construction: 37
- Professional, Scientific, and Technical Services: 20
- Manufacturing: 16
- Wholesale Trade: 16
- Health Care and Social Assistance: 16
- Retail Trade: 15
- Other Services (except Public Administration): 15
- Accommodation and Food Services: 13
EDDM carrier routes
91978 has 6 USPS carrier routes with 3,506 residential and 240 business mailboxes. Open the EDDM route map.
Carrier routes in 91978
91978 has 6 USPS carrier routes (5 city (C), 1 rural (R)) with 3,506 residential and 240 business mailboxes. Routes range from 153 homes (C025) to 879 homes (C010); the median route has 713 homes. The Census counted 3,236 households in 91978 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 2 |
| 250–499 | 0 |
| 500–749 | 2 |
| 750–999 | 2 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 91978 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C010 — USPS business mailboxes 154, 879 homes
- Route C017 — USPS business mailboxes 25, 836 homes
- Route C031 — USPS business mailboxes 24, 680 homes
- Route R001 — USPS business mailboxes 20, 212 homes
- Route C002 — USPS business mailboxes 17, 746 homes
Select these 5 routes on the route map
Every carrier route in 91978
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C002 | City | 746 | 17 | $118,318 | — | — | — |
| C010 | City | 879 | 154 | $118,318 | — | — | — |
| C017 | City | 836 | 25 | $43,115 | — | — | — |
| C025 | City | 153 | 0 | $130,751 | — | — | — |
| C031 | City | 680 | 24 | $126,922 | — | — | — |
| R001 | Rural | 212 | 20 | $105,141 | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 91978 on the EDDM route map.
How route demographics are estimated
Mailbox counts come from USPS; demographics are estimates
The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).
How a route gets its figures: the block-group length-share method
We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.
Margins of error
Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.
Different years
USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.
Why some routes show identical figures
Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.
Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
Nearby ZIP codes
- 91914 — Chula Vista city, CA (2.6 mi)
- 91977 — La Presa CDP, CA (4.1 mi)
- 91902 — Bonita CDP, CA (4.7 mi)
- 91915 — Chula Vista city, CA (5.3 mi)
- 91941 — Casa de Oro-Mount Helix CDP, CA (5.7 mi)
- 91913 — Chula Vista city, CA (6.2 mi)
- 91945 — Lemon Grove city, CA (6.4 mi)
- 92019 — Rancho San Diego CDP, CA (6.5 mi)
Areas that include 91978
- Spring Valley, CA ZIP codes — 2 ZIP codes
- Jamul, CA ZIP codes — 2 ZIP codes
- San Diego County ZIP codes — 116 ZIP codes
- California ZIP code data
Where it ranks
Mail every home in 91978
Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.
EDDM guides
ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 91978, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 91978 in?
- 91978 is a Spring Valley, CA mailing address. By land area, 31% lies inside Spring Valley and 11% lies inside Jamul; the rest is outside any Census-defined city or community.
- What county is 91978 in?
- 91978 is in San Diego County.
- What is the population of 91978?
- About 10,014 people (±1,084), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 9,949.
- What is the median household income in 91978?
- $113,170 (±$11,519), compared with $99,122 for California as a whole. Half the households in the ZIP code earn more and half earn less.
- How many carrier routes and mailboxes are in 91978?
- 6 USPS carrier routes with 3,506 residential and 240 business mailboxes (3,747 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 91978?
- The closest, measured center to center: 91914 (2.6 mi, Chula Vista), 91977 (4.1 mi, La Presa), 91902 (4.7 mi, Bonita), 91915 (5.3 mi, Chula Vista), 91941 (5.7 mi, Casa de Oro-Mount Helix) and 91913 (6.2 mi, Chula Vista).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.