🇺🇸 United States ZIP Code

STANDARD

91978

Spring Valley

ZIP Code 91978 is a standard zip code serving Spring Valley, Spring Valley, California (CA), in San Diego County, United States. It has an estimated population of 8,896 with a median household income of $69,601. The area falls within the America/Los_Angeles timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: California (CA)
County: San Diego
City: Spring Valley
Timezone: America/Los_Angeles

Coordinates

Latitude: 32.732900
Longitude: -116.959600

Geographic Details

Land Area: 6.40 mi²
Water Area: 0.37 mi²
Population Density: 1390.0 people per mi² (80th percentile)
Bounding Box: 32.745800°N, 32.704276°S, -116.892631°E, -116.979987°W

With 8,896 residents spread across 6.40 square miles, this area has a population density of 1390.0 people per square mile.

Demographics

8,896

Population

65th percentile

$69,601

Median Income

80th percentile

$344,400

Median Home Value

90th percentile

6.40 mi²

Land Area

The median household income in 91978 is $69,601, and the median home value is $344,400. This places the area in the top 25% nationally for household income.

Housing

3,159

Total Units

3,024

Occupied Units

95.7%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Spring Valley, CA.

91976

Spring Valley

91977

Spring Valley

91979

Spring Valley

Similar ZIP Codes in California

ZIP codes with similar median household income in California.

93921

Carmel By The Sea

$66,231

93446

Paso Robles

$62,529

90601

Whittier

$69,375

93432

Creston

$60,759

90401

Santa Monica

$62,794

95018

Felton

$71,964

95467

Hidden Valley Lake

$63,281

95304

Tracy

$79,029

Frequently Asked Questions

What information is available for each ZIP code?

Each ZIP code page shows city, state, county, geographic coordinates, timezone, population, median household income, median home value, housing units, land area, population density, commute time, educational attainment, area codes, and ZIP code type (Standard, PO Box, or Unique).

What are the different types of ZIP codes?

There are three types of ZIP codes: Standard (residential and commercial delivery areas), PO Box (assigned to post office box sections), and Unique (assigned to a single high-volume address like a government agency or large company). Standard ZIP codes are the most common.

How often is ZIP code data updated?

ZIP code assignments are updated quarterly by the USPS. Demographic data comes from the US Census Bureau's American Community Survey (ACS), which releases new 5-year estimates annually. ZipFYI updates its data to reflect the latest available information.

What is population density and why does it matter?

Population density measures the number of people per square mile in a ZIP code area. It helps identify urban vs. rural areas, affects real estate values, impacts service availability, and is used in market analysis. Dense urban ZIP codes may have 50,000+ people per square mile.

How are ZIP code boundaries determined?

ZIP code boundaries are determined by the USPS based on mail delivery routes, not political or geographic boundaries. They follow carrier routes and may cross city, county, or even state lines. Boundaries can change when the USPS reorganizes delivery operations.

What does median household income tell me about a ZIP code?

Median household income is the middle value when all household incomes in a ZIP code are sorted. Half of households earn more and half earn less. It is a better indicator of typical earnings than average income, which can be skewed by very high or very low outliers.