91977 ZIP Code, Spring Valley, CA
91977 is a ZIP code in Spring Valley, California in San Diego County. It covers 9.9 square miles of land. The closest ZIP codes are 91941, 91945 and 91902. 61,064 people live here in 19,118 households, more than in 9 of every 10 California ZIP codes. At about 6,157 people per square mile it is built up to city-neighborhood density, and owners and renters are mixed (64% own). Median household income is $99,657, close to the California median of $99,122.
Quick facts
- Mailing city: Spring Valley, CA
- County: San Diego County
- Land area: 9.9 sq mi
- Population: 61,064
- Median household income: $99,657
- Carrier routes: 29 (19,560 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 61,064 |
| Households | 19,118 |
| Median household income | $99,657 |
| Income per person | $39,866 |
| Median age | 35.8 |
| Homeowners | 63.8% |
| Median home value | $665,600 |
| Median rent | $1,925 |
| Bachelor's degree or higher | 27.7% |
| Average commute (minutes) | 26.5 |
| Households with kids under 18 | 36.5% |
| Moved in the past year | 9.4% |
| Below the poverty line | 9.7% |
| Broadband internet | 92.7% |
| Speak a non-English language at home | 41.8% |
Household income
| % of households | Value |
|---|---|
| <$10K | 3.2% |
| $10–15K | 2.0% |
| $15–25K | 3.6% |
| $25–35K | 4.0% |
| $35–50K | 9.2% |
| $50–75K | 13.7% |
| $75–100K | 14.4% |
| $100–150K | 22.7% |
| $150–200K | 10.5% |
| $200K+ | 16.7% |
Age
| % of all residents | Value |
|---|---|
| <10 | 12.8% |
| 10–19 | 13.1% |
| 20–24 | 5.8% |
| 25–34 | 16.4% |
| 35–44 | 14.2% |
| 45–54 | 12.8% |
| 55–64 | 11.0% |
| 65–74 | 8.9% |
| 75+ | 5.1% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 45.5% |
| Owned outright | 16.7% |
| Rented | 35.0% |
| Vacant | 2.8% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 62.3% |
| Townhome | 8.7% |
| 2–4 units | 5.1% |
| 5–19 units | 9.1% |
| 20+ units | 9.0% |
| Mobile / other | 5.8% |
Businesses in 91977
829 business establishments with 7,111 employees (ZIP Codes Business Patterns 2023).
- Construction: 198
- Retail Trade: 102
- Health Care and Social Assistance: 93
- Other Services (except Public Administration): 78
- Accommodation and Food Services: 69
- Administrative and Support and Waste Management and Remediation Services: 67
- Professional, Scientific, and Technical Services: 53
- Real Estate and Rental and Leasing: 52
EDDM carrier routes
91977 has 29 USPS carrier routes with 19,560 residential and 824 business mailboxes. Open the EDDM route map.
Carrier routes in 91977
91977 has 29 USPS carrier routes (29 city (C)) with 19,560 residential and 824 business mailboxes. Routes range from 453 homes (C007) to 945 homes (C004); the median route has 653 homes. The Census counted 19,118 households in 91977 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 3 |
| 500–749 | 16 |
| 750–999 | 10 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 91977 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C032 — USPS business mailboxes 113, 501 homes
- Route C038 — USPS business mailboxes 86, 560 homes
- Route C016 — USPS business mailboxes 59, 828 homes
- Route C033 — USPS business mailboxes 57, 728 homes
- Route C039 — USPS business mailboxes 54, 878 homes
Select these 5 routes on the route map
Every carrier route in 91977
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C003 | City | 724 | 7 | $66,553 | — | — | — |
| C004 | City | 945 | 44 | $72,747 | — | — | — |
| C005 | City | 597 | 32 | $109,686 | — | — | — |
| C006 | City | 456 | 44 | $110,222 | — | — | — |
| C007 | City | 453 | 13 | $96,395 | — | — | — |
| C009 | City | 624 | 45 | $112,316 | — | — | — |
| C011 | City | 800 | 31 | $110,222 | — | — | — |
| C012 | City | 607 | 36 | $73,644 | — | — | — |
| C013 | City | 531 | 0 | $94,596 | — | — | — |
| C014 | City | 500 | 23 | $100,148 | — | — | — |
| C015 | City | 653 | 1 | $127,541 | — | — | — |
| C016 | City | 828 | 59 | $55,308 | — | — | — |
| C021 | City | 770 | 3 | $66,553 | — | — | — |
| C022 | City | 611 | 2 | $89,441 | — | — | — |
| C023 | City | 687 | 1 | $117,596 | — | — | — |
| C024 | City | 624 | 2 | $95,521 | — | — | — |
| C026 | City | 556 | 27 | $66,076 | — | — | — |
| C028 | City | 698 | 5 | $76,255 | — | — | — |
| C029 | City | 469 | 9 | $71,299 | — | — | — |
| C030 | City | 590 | 18 | $84,521 | — | — | — |
| C032 | City | 501 | 113 | $112,316 | — | — | — |
| C033 | City | 728 | 57 | $84,521 | — | — | — |
| C034 | City | 755 | 31 | $32,763 | — | — | — |
| C035 | City | 781 | 2 | $117,596 | — | — | — |
| C036 | City | 817 | 25 | $133,202 | — | — | — |
| C037 | City | 887 | 52 | $76,864 | — | — | — |
| C038 | City | 560 | 86 | $73,644 | — | — | — |
| C039 | City | 878 | 54 | $67,604 | — | — | — |
| C041 | City | 930 | 2 | $133,202 | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 91977 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
- 91941 — Casa de Oro-Mount Helix CDP, CA (2.3 mi)
- 91945 — Lemon Grove city, CA (2.4 mi)
- 91902 — Bonita CDP, CA (3.7 mi)
- 92114 — San Diego city, CA (3.8 mi)
- 91942 — La Mesa city, CA (3.9 mi)
- 91978 — Spring Valley CDP, CA (4.1 mi)
- 92139 — San Diego city, CA (4.5 mi)
- 91914 — Chula Vista city, CA (4.8 mi)
Areas that include 91977
- La Presa, CA ZIP codes — 1 ZIP code
- Spring Valley, CA ZIP codes — 2 ZIP codes
- Casa de Oro-Mount Helix, CA ZIP codes — 3 ZIP codes
- San Diego County ZIP codes — 116 ZIP codes
- California ZIP code data
Where it ranks
Mail every home in 91977
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) 91977, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 91977 in?
- 91977 is a Spring Valley, CA mailing address. By land area, 54% lies inside La Presa, 34% lies inside Spring Valley and 12% lies inside Casa de Oro-Mount Helix.
- What county is 91977 in?
- 91977 is in San Diego County.
- What is the population of 91977?
- About 61,064 people (±2,412), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 60,795.
- What is the median household income in 91977?
- $99,657 (±$5,444), 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 91977?
- 29 USPS carrier routes with 19,560 residential and 824 business mailboxes (20,386 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 91977?
- The closest, measured center to center: 91941 (2.3 mi, Casa de Oro-Mount Helix), 91945 (2.4 mi, Lemon Grove), 91902 (3.7 mi, Bonita), 92114 (3.8 mi, San Diego), 91942 (3.9 mi, La Mesa) and 91978 (4.1 mi, Spring Valley).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.