Castro Valley vs Union City

A side-by-side comparison of Castro Valley and Union City: population, income, housing, and more.

Castro Valley and Union City are places in California. This page compares them across population, income, housing, education, commuting, and how each has changed since 2019.

Union City has the higher population (68,141 vs 65,389 in Castro Valley). Castro Valley has the higher median household income ($138,069 vs $137,194 in Union City). Both have a median home value of $1,058,200.

Population, income & housing

	Castro Valley	Union City
Population	65,389	68,141
Median age	42.8 yrs	42.1 yrs
Median household income	$138,069	$137,194
Median home value	$1,058,200	$1,058,200
Median gross rent	$2,499	$2,713
Housing units	22,909	21,923
Homeownership rate	71.5%	67.0%
Bachelor's degree or higher	43.9%	45.3%
Unemployment rate	3.8%	5.0%

Trends (ACS 5-year, 2019–2023)

	Castro Valley	Union City
Population	63,013 → 65,389 (+3.8%)	74,722 → 68,141 (-8.8%)
Median household income	$108,488 → $138,069 (+27.3%)	$114,681 → $137,194 (+19.6%)
Median home value	$741,500 → $1,058,200 (+42.7%)	$765,500 → $1,058,200 (+38.2%)
Median gross rent	$1,791 → $2,499 (+39.5%)	$2,202 → $2,713 (+23.2%)

Castro Valley

Population

63,01365,389

Median household income

$108,488$138,069

Median home value

$741,500$1,058,200

Median gross rent

$1,791$2,499

Union City

Population

74,72268,141

Median household income

$114,681$137,194

Median home value

$765,500$1,058,200

Median gross rent

$2,202$2,713

Age & race/ethnicity

Age distribution (share)

	Castro Valley	Union City
Under 5	5.0%	4.6%
5 to 17	16.0%	13.6%
18 to 24	5.5%	7.0%
25 to 34	11.6%	14.4%
35 to 44	15.4%	15.0%
45 to 54	13.7%	13.3%
55 to 64	14.7%	14.0%
65 to 74	11.5%	10.6%
75 and over	6.7%	7.5%

Race & ethnicity (share)

	Castro Valley	Union City
White (non-Hispanic)	34.3%	14.6%
Black or African American	8.6%	5.3%
American Indian & Alaska Native	0.3%	0.2%
Asian	33.9%	55.4%
Native Hawaiian & Pacific Islander	0.1%	0.8%
Some other race	0.2%	0.5%
Two or more races	4.9%	3.9%
Hispanic or Latino	17.6%	19.3%

Educational attainment (age 25+)

Share of adults 25+

	Castro Valley	Union City
No high school diploma	9.6%	12.6%
High school graduate	16.9%	18.9%
Some college or associate's	29.7%	23.1%
Bachelor's degree	26.9%	27.7%
Graduate or professional degree	17.0%	17.6%

Commute to work

How workers get to work (share)

	Castro Valley	Union City
Drove alone	65.7%	61.5%
Carpooled	7.7%	12.5%
Public transit	5.9%	5.1%
Walked	1.1%	0.8%
Bicycle	0.7%	0.3%
Worked from home	18.4%	17.7%
Other means	0.7%	2.2%

Housing

Units in structure (share)

	Castro Valley	Union City
1-unit, detached	73.1%	60.0%
1-unit, attached	7.6%	11.7%
2 to 4 units	5.9%	5.9%
5 to 19 units	4.6%	4.4%
20 or more units	7.5%	12.7%
Mobile home & other	1.2%	5.3%

Poverty & households

	Castro Valley	Union City
Poverty rate	7.5%	7.0%
Average household size	2.89	3.16
Mean commute (minutes)	34	33
Median year structure built	1966	1979