Here is a list of snakes located in California for you. It excludes garter snakes, rattle snakes, and sea snakes.
Boidae - Boas and Pythons
Charina - Rubber Boas
C. bottae - Coastal Rubber Boa
C. umbratica - Southern Rubber Boa
Lichanura - Rosy Boas
L. t. gracia - Desert Rosy Boa
L. t. roseofusca - Coastal Rosy Boa
Colubridae - Colubrids
Arizona - Glossy Snakes
A. elegans - Western Glossy Snake
A. e. candida - Mojave Glossy Snake
A. e. eburnata - Desert Glossy Snake
A. e. occidentalis - California Glossy Snake
Bogertophis - Desert Ratsnakes
B. rosaliae - Baja California Ratsnake
Chionactis - Shovel-nosed Snakes
C. occipitalis - Western Shovel-nosed Snake
C. o. annulata - Colorado Desert Shovel-nosed Snake
C. o. occipitalis - Mojave Shovel-nosed Snake
C. o. talpina - Nevada Shovel-nosed Snake
Coluber - North American Racers
C. constrictor - Eastern Racer
C. constrictor mormom - Western Yellow-bellied Racer
Contia - Sharp-tailed Snakes
C. tenius - Sharp-tailed Snake
Diadophis - Ring-necked Snakes
D. punctatus - Ring-necked Snake
D. p. amabilis - Pacific Ring-necked Snake
D. p. modestus - San Bernardino Ring-necked Snake
D. p. occidentalis - Northwestern Ring-necked Snake
D. p. pulchellus - Coral-bellied Ring-necked Snake
D. p. regalis - regal Ring-necked Snake
D. p. similis - San Diego Ring-necked Snake
D. p. vandenburgii - Monterey Ring-necked Snake
Hypsiglena - Fangless Nightsnakes
H. torquata - Nightsnake
H. t. nuchalata - California Nightsnake
H. t. deserticola - Desert Nightsnake
Lampropeltis - Kingsnakes and Milksnakes
L. getula - Common Kingsnake
L. g. californiae - California Kingsnake
L. zonata - California Mountain Kingsnake
Masticophis - Whipsnakes, Striped Racers, & Coachwhips
M. flagellum - Coachwhip
M. f. piceus - Red Coachwhip
M. f. ruddocki - San Joaquin Coachwhip
M. fuliginosus - Baja California Coachwhip
M. lateralis - Striped Racer
M. I. euryxanthus - Almeda Striped Racer
M. I. lateralis - California Striped Racer
Nerodia - American Watersnakes
N. fasciata - Southern Watersnake
Phyllorhynchus - Leaf-nosed Snakes
P. decurtatus - Spotted Leaf-nosed Snake
P. catenifer - Gophersnake
P. c. affinis - Sonoran Gophersnake
P. c. annectens - San Diego Gophersnake
P. c. catenifer - Pacific Gophersnake
P. c. deserticola - Great Basin Gophersnake
P. c. pumilis - Santa Cruz Island Gophersnake
R. lecontei - Long-nosed Snake
R. i. lecontei - Western Long-nosed Snake
Salvadora - Patch-nosed Snakes
S. hexalepis - Western Patch-nosed Snake
S. h. hexalepis - Desert Patch-nosed Snake
S. h. mojavensis - Mojave Patch-nosed Snake
S. h. virgultea - Coast Patch-nosed Snake
Sonora - North American Groundsnakes
S. s. semiannulata - Variable Groundsnake
Tantilla - Black-headed Snakes
T. hobartsmithi - Smith's Black-headed Snake
T. planiceps - Western Black-headed Snake
Trimorphodon - Lyresnakes
T. b. lambda - Sonoran Lyresnake
T. b. lyrophanes - Baja California Lyresnake
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0.1 Snow Corn "Hope"
1.0 Ball Python "Wilson" (Castaway)
1. Orange Albino Black Ratsnake "Chunk" (Goonies)
.1 Orange Albino Black Ratsnake "Peaches"
0.0.1 Mexican Black Kingsnake "Onyx"