ZIP code 91978
Where is ZIP code 91978?
Spring Valley, California
San Diego County · Standard ZIP code
ZIP code 91978 belongs to Spring Valley, California in San Diego County. 91978 is a standard ZIP code, so it covers street addresses as well as PO Boxes. It is in the Pacific Time zone and uses area codes 619 and 858. About 10,014 people live in the 91978 area, where the median household income is $113,170. The closest ZIP codes are 91977 (Spring Valley, 2.3 mi west), 91976 (Spring Valley, 2.4 mi west) and 91979 (Spring Valley, 2.4 mi west).
| ZIP code | 91978 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Spring Valley |
| State | California (CA) |
| County | San Diego County |
| Time zone | Pacific Time · now |
| Area codes | 619, 858 |
| Coordinates | 32.7329, -116.9596 map |
| 3-digit prefix | 919 |
Population and income in 91978
| Population | 10,014 · lower than 57% of California ZIP codes |
|---|---|
| People per square mile | 839 · higher than 50% of California ZIP codes |
| Median age | 42.5 years · higher than 61% of California ZIP codes |
| Men / women | 50% / 50% |
| Median household income | $113,170 · higher than 68% of California ZIP codes |
| Income per person | $44,103 |
| Below the poverty line | 10% |
| Bachelor’s degree or higher | 31% of adults 25+ |
| Median home value | $637,200 · lower than 52% of California ZIP codes |
| Median rent | $2,327 a month |
| Housing units | 3,311 |
| Households | 3,236 (3.09 people on average) |
| Owners / renters | 68% / 32% |
| Land area | 11.94 sq mi (plus 0.03 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 91978. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 91978
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 91977 | Spring Valley, CA | 2.3 mi W | Standard |
| 91976 | Spring Valley, CA | 2.4 mi W | PO Box only |
| 91979 | Spring Valley, CA | 2.4 mi W | PO Box only |
| 91941 | La Mesa, CA | 3.6 mi NW | Standard |
| 92019 | El Cajon, CA | 3.9 mi NE | Standard |
| 92020 | El Cajon, CA | 4.2 mi N | Standard |
| 91946 | Lemon Grove, CA | 4.2 mi W | PO Box only |
| 91945 | Lemon Grove, CA | 4.2 mi W | Standard |
| 92022 | El Cajon, CA | 4.3 mi N | PO Box only |
| 91943 | La Mesa, CA | 4.4 mi NW | PO Box only |
| 91944 | La Mesa, CA | 4.4 mi NW | PO Box only |
| 91942 | La Mesa, CA | 4.9 mi NW | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 91978 or measure the distance to another ZIP code.
How to address mail to 91978
123 MAIN ST
SPRING VALLEY CA 91978
Put the city, the two-letter state code and the ZIP code on the last line. Adding the 4-digit ZIP+4 code (91978-XXXX) helps mail sort faster but isn’t required.
Other ZIP codes in Spring Valley, CA
All Spring Valley ZIP codes with population and income →
Questions
- What city is ZIP code 91978?
- 91978 is a Spring Valley, California ZIP code.
- What county is 91978 in?
- ZIP code 91978 is in San Diego County, California.
- What time zone is ZIP code 91978 in?
- 91978 is in the Pacific Time zone (America/Los_Angeles).
- What area code is 91978?
- Phone numbers in ZIP code 91978 use area codes 619 and 858.
- What is the population of ZIP code 91978?
- About 10,014 people live in ZIP code 91978, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 91978?
- The median household income in 91978 is $113,170 a year, higher than 68% of California ZIP codes.
- What ZIP codes are near 91978?
- The nearest ZIP codes to 91978 are 91977 (Spring Valley, 2.3 miles), 91976 (Spring Valley, 2.4 miles), 91979 (Spring Valley, 2.4 miles) and 91941 (La Mesa, 3.6 miles).