Contra Costa County, CA
County26342 species observed across 8 groups · Pop. 1.2M
Ecoregions
Species observed
Increased Seasonal Activity
Currently Flowering
Birds· 863 species
Mammals· 239 species
Plants· 8488 species
Reptiles & Amphibians· 200 species
Fish· 418 species
Insects· 8901 species
Other Invertebrates· 2262 species
Fungi & Lichens· 4971 species
Explore nearby
Part of
StateCaliforniaPop. 39.5MCities in Contra Costa County
Antioch, CAPop. 115.4KBrentwood, CAPop. 64.5KClayton, CAPop. 11.1KConcord, CAPop. 125.3KDanville, CAPop. 43.6KHercules, CAPop. 26.1KLafayette, CAPop. 25.4KMartinez, CAPop. 37.2KMoraga, CAPop. 16.9KOakley, CAPop. 43.5KOrinda, CAPop. 19.5KPinole, CAPop. 19.0KPittsburg, CAPop. 76.4KPleasant Hill, CAPop. 34.6KRichmond, CAPop. 116.2KSan Pablo, CAPop. 32.1KSan Ramon, CAPop. 86.4KWalnut Creek, CAPop. 70.2K