🇺🇸 United States ZIP Code

STANDARD

94546

Castro Valley

ZIP Code 94546 is a standard zip code serving Castro Valley, Castro Valley, California (CA), in Alameda County, United States. It has an estimated population of 42,209 with a median household income of $73,099. The area falls within the America/Los_Angeles timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: California (CA)
County: Alameda
City: Castro Valley
Timezone: America/Los_Angeles

Coordinates

Latitude: 37.701500
Longitude: -122.078200

Geographic Details

Land Area: 9.42 mi²
Water Area: 0.26 mi²
Population Density: 4479.0 people per mi² (90th percentile)
Bounding Box: 37.762727°N, 37.678926°S, -122.054432°E, -122.127391°W

With 42,209 residents spread across 9.42 square miles, this area has a population density of 4479.0 people per square mile.

Demographics

42,209

Population

95th percentile

$73,099

Median Income

85th percentile

$475,300

Median Home Value

95th percentile

9.42 mi²

Land Area

The median household income in 94546 is $73,099, and the median home value is $475,300. This places the area in the top 25% nationally for household income.

Housing

16,929

Total Units

16,117

Occupied Units

95.2%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Castro Valley, CA.

94552

Castro Valley

Similar ZIP Codes in California

ZIP codes with similar median household income in California.

91978

Spring Valley

$69,601

93424

Avila Beach

$75,043

94519

Concord

$70,476

96145

Tahoe City

$66,628

95465

Occidental

$76,439

90715

Lakewood

$65,481

94061

Redwood City

$79,833

92342

Helendale

$65,794

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.