ZIP Code 94528
About Diablo
Diablo is a census-designated place (CDP) in Contra Costa County, California, United States. The population was 1,255 at the 2020 census. It is located 2.5 miles (4.0 km) east-northeast of Danville.
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Area Profile
US Census (ACS 5-year · Gazetteer)
1,000
population
867
people / sq mi
$2,000,001
median home value
37.8
median age
408
housing units
371
households
1.2
land area (sq mi)