Home›Census-designated places in California›Castle Hill🌐EnglishEnglishDeutschEspañolFrançaisItalianoPolskiTürkçeفارسی中文EntityQ5050120· pop 20· linked from 106 articlesCastle HillAlso known as Castle Hill, California, Castle Hill, CAcensus-designated place in Contra Costa County, California, USAWikidata factsDialing code925Sources (7)wikidata.orggeonames.usgs.goven.wikipedia.orgdata.census.govuk.wikipedia.orgdata.census.govdata.census.govOn the mapAvailable in 20 languagesEspañolFrançais中文ItalianoazbBasqueChechenCroatianGilakiHungarianConnectionsSan Mateo CountyEntityUnited States Census BureauEntityCategoriesCensus-designated places in CaliforniaCensus-designated places in Contra Costa County, California