Zip Code 94546
Castro Valley, California — Alameda County
📍 ZIP code 94546 is in Castro Valley, Alameda County, California.
ZIP code 94546 is located in Castro Valley, Alameda County, California. It is a zip code in the Pacific (PST/PDT) Time Zone with an estimated population of 45,848. The area code for ZIP code 94546 is 408.
Quick Answer
Zip code 94546 is in Castro Valley, California (Alameda County). It has a population of 45,848, median household income of $125,780, and median home value of $976,300.
Population
45,848
Income
$125,780
Home Value
$976,300
Climate
75°F / 43°F
About Zip Code 94546
Zip code 94546 is located in Castro Valley, California, within Alameda County. Home to approximately 45,848 residents, this area sits at an elevation of 456 ft and falls within the Pacific (PST/PDT) timezone. The local area code is 408.
The median household income is $125,780 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $976,300, and the cost of living index is 250 (150% above the national average of 100).
Summers average a high of 75°F while winters drop to 43°F. The area receives about 16 in of rain annually. The zip code covers 9.6 square miles of land area and 0.2 square miles of water.
Key Statistics
45,848
$125,780
$976,300
Pacific (PST/PDT)
408
456 ft
9.6 sq mi
42.1
16,398
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Compare With Nearby Zip Codes
| Metric | 94546 | 94578 | 94541 | 94552 | 94580 | 94579 |
|---|---|---|---|---|---|---|
| City | Castro Valley, CA | San Leandro, CA | Hayward, CA | Castro Valley, CA | San Lorenzo, CA | San Leandro, CA |
| Population | 45,848 | 41,567 | 67,785 | 14,359 | 28,866 | 19,955 |
| Median Income | $125,780 | $89,149 | $106,556 | $205,170 | $110,106 | $94,193 |
| Home Value | $976,300 | $793,500 | $781,900 | $1,286,300 | $820,100 | $815,900 |
| Cost of Living | 250 | 204 | 212 | 250 | 224 | 218 |
| Median Age | 42.1 | 37.7 | 37.9 | 48.6 | 41.6 | 46.9 |
Cost of Living
100 = National Average. Castro Valley's cost of living is 150% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
7.8x
Demographics
Zip code 94546 has a population of 45,848 people with a median age of 42.1. There are 16,398 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Castro Valley (94546) population trend from 2010 to 2024
↓ -7.1%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
75°F
43°F
16 in
0 in
Castro Valley experiences mild summers with average highs around 75°F. Winters are mild with lows averaging 43°F. The area receives virtually no snowfall.
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Housing & Economy
Median Home Value
$976,300
Median Household Income
$125,780
With 16,398 housing units across 9.6 square miles, 94546 has a housing density of 1,708 units per square mile. The home price-to-income ratio is 7.8x.
Location & Geography
Latitude
37.7173°
Longitude
-122.0820°
Land Area
9.6 sq mi
Water Area
0.2 sq mi
Nearby Zip Codes
Zip codes closest to 94546 (Castro Valley, CA) with distances:
All Zip Codes in Castro Valley, CA
Other zip codes serving Castro Valley:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 94546's $125,780. A way to compare Castro Valley to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 94546 (Castro Valley, CA). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is Castro Valley, California?
Castro Valley, California uses zip code 94546 along with 1 other zip codes.
What county is zip code 94546 in?
Zip code 94546 is located in Alameda County, California.
What is the population of zip code 94546?
The population of zip code 94546 is 45,848 with a median age of 42.1.
Is 94546 in Castro Valley, California?
Yes, zip code 94546 is in Castro Valley, Alameda County, California. The area code is 408.
Frequently Asked Questions
What city is zip code 94546 in?
Zip code 94546 is in Castro Valley, California. It is part of Alameda County and uses the Pacific (PST/PDT) timezone.
What is zip code 94546?
Zip code 94546 is a U.S. postal code in Castro Valley, California (Alameda County). It has a population of 45,848 and covers 9.6 square miles.
What is the population of zip code 94546?
The population of zip code 94546 (Castro Valley, CA) is 45,848 with a median age of 42.1. There are approximately 16,398 housing units in this area.
What is the median income in zip code 94546?
The median household income in zip code 94546 (Castro Valley, CA) is $125,780 per year. The cost of living index is 250 (100 = national average).
What is the average home price in zip code 94546?
The median home value in zip code 94546 (Castro Valley, CA) is $976,300. The cost of living index is 250 compared to the national average of 100.
What county is zip code 94546 in?
Zip code 94546 is located in Alameda County, California. The primary city is Castro Valley.
What is the area code for zip code 94546?
Zip code 94546 in Castro Valley, CA uses area code 408. It is located in the Pacific (PST/PDT) timezone.
Is zip code 94546 a good place to live?
Zip code 94546 (Castro Valley, CA) has a cost of living index of 250 (100 = national average), a median household income of $125,780, and median home values of $976,300. The median age is 42.1. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 94546?
The cost of living index for zip code 94546 (Castro Valley, CA) is 250, where 100 represents the national average. This area is above the national average. Median home value: $976,300.
What schools serve zip code 94546?
Zip code 94546 in Castro Valley, California is served by the local school district of Alameda County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.