Zip Code 94546 is located in the state of California in the San Francisco – Oakland – San Jose metro area. Zip code 94546 is primarily located in Alameda County. The official US Postal Service name for 94546 is CASTRO VALLEY, California. Portions of zip code 94546 are contained within or border the city limits of Castro Valley, CA, Hayward, CA, Oakland, CA, Ashland, CA, Fairview, CA, and Cherryland, CA. The area code for this zip code is 510. 94546 can be classified socioeconically as a Middle Class class zipcode in comparison to other zipcodes in California.

The current unemployment level in 94546 is 3.4% which is lower than the current county unemployment level of 4.6% and is lower than the current state unemployment at 3.8% and lower than the current national unemployment rate at 3.6%.

According the 2010 US Census, the population of 94546 increased to 42209 from 41680 over the past 10 years. The majority ethnicity residing in 94546 is White while the majority ethnicity attending 94546 public schools is White. 26.9% of students in 94546 public schools receive or are eligible to participate in free or reduced lunch programs.