IT & computer services in California
15,112 iT & computer services listed across 600 cities in California.
IT & computer services make up 1.1% of California listings, compared with 1.1% across all states we cover. That ranks California #2 of 5 states for this category.
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USA Business Search lists 15,112 iT & computer services in California. The most are in San Francisco (1,358), San Diego (958), Los Angeles (889).
Updated October 2026Featured · From the team behind USA Business Search
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IT & computer services by city
San Francisco (1,358)San Diego (958)Los Angeles (889)San Jose (681)Irvine (604)Santa Clara (377)Fremont (244)Sacramento (233)Palo Alto (223)San Mateo (191)Sunnyvale (174)Pleasanton (170)Mountain View (164)Oakland (143)Fresno (130)Anaheim (125)Milpitas (124)Redwood City (123)Newport Beach (119)Carlsbad (117)Bakersfield (116)Pasadena (115)Santa Ana (113)Costa Mesa (112)Torrance (111)Glendale (109)Riverside (106)Santa Monica (99)Burbank (99)San Ramon (93)Long Beach (93)Campbell (91)Santa Barbara (89)Woodland Hills (87)Walnut Creek (86)Roseville (86)Tustin (84)Rancho Cucamonga (78)Huntington Beach (77)Santa Rosa (73)Corona (69)Orange (66)Menlo Park (65)Berkeley (65)Temecula (64)Cupertino (63)Ontario (62)El Segundo (61)Lake Forest (60)Folsom (60)Simi Valley (56)Newark (56)Chula Vista (53)Burlingame (52)Modesto (51)Laguna Hills (51)Beverly Hills (51)Ventura (49)Culver City (49)San Luis Obispo (47)Escondido (46)Dublin (46)Camarillo (45)Westlake Village (44)Stockton (44)Concord (44)Santa Cruz (43)Redding (43)Murrieta (43)Chatsworth (42)Van Nuys (41)Valencia (41)Santa Clarita (41)Brea (41)Thousand Oaks (40)Fountain Valley (40)Fullerton (39)San Rafael (38)San Clemente (38)Hayward (38)Garden Grove (38)Chico (38)Calabasas (38)Elk Grove (36)Sherman Oaks (35)San Marcos (35)Chino (35)Visalia (34)South San Francisco (34)Rocklin (34)Los Gatos (34)Los Altos (34)El Cajon (34)Encino (33)Salinas (32)Oxnard (32)Napa (32)Mission Viejo (32)La Jolla (32)Walnut (31)Petaluma (31)Oceanside (31)Victorville (30)El Dorado Hills (30)Clovis (30)Rancho Santa Margarita (29)Aliso Viejo (29)Alameda (29)Redondo Beach (28)Novato (28)Agoura Hills (28)West Hollywood (27)Redlands (27)Livermore (27)Emeryville (27)City of Industry (27)San Bernardino (26)Gardena (26)Encinitas (26)Lancaster (25)Upland (24)Palm Desert (24)Cerritos (24)Vista (23)Santa Fe Springs (23)Rancho Cordova (23)North Hollywood (23)Marina del Rey (23)Northridge (22)Manhattan Beach (22)Canoga Park (22)Venice (21)Tarzana (21)San Leandro (21)Rialto (21)Poway (21)Palmdale (21)El Monte (21)Alhambra (21)Yuba City (20)Whittier (20)Vallejo (20)Santa Maria (20)San Juan Capistrano (20)Pleasant Hill (20)Monterey (20)Foster City (20)Fontana (20)Downey (20)Scotts Valley (19)Pomona (19)Inglewood (19)Arcadia (19)West Covina (18)San Carlos (18)Paso Robles (18)Tracy (17)Studio City (17)Sausalito (17)Laguna Niguel (17)Lafayette (17)Goleta (17)Foothill Ranch (17)Diamond Bar (17)Covina (17)Brentwood (17)Auburn (17)Turlock (16)Solana Beach (16)San Dimas (16)Morgan Hill (16)Monrovia (16)Los Alamitos (16)Hemet (16)Fairfield (16)Carmichael (16)Yorba Linda (15)Vacaville (15)Hawthorne (15)Glendora (15)Chino Hills (15)Buena Park (15)Atascadero (15)Woodland (14)Moreno Valley (14)Menifee (14)Lodi (14)La Mesa (14)Fair Oaks (14)Cypress (14)Citrus Heights (14)Westminster (13)Watsonville (13)Signal Hill (13)Lake Elsinore (13)Gilroy (13)El Centro (13)Danville (13)Apple Valley (13)Union City (12)Saratoga (12)San Gabriel (12)Rohnert Park (12)Merced (12)Grass Valley (12)Antioch (12)Montclair (11)Granada Hills (11)Commerce (11)West Sacramento (10)Seal Beach (10)Richmond (10)Placentia (10)Mill Valley (10)Manteca (10)La Puente (10)Eureka (10)Dana Point (10)Benicia (10)Belmont (10)Arroyo Grande (10)Aptos (10)Ukiah (9)San Pedro (9)Palm Springs (9)Newbury Park (9)National City (9)Ladera Ranch (9)La Crescenta (9)Hanford (9)Gold River (9)Davis (9)Yucaipa (8)South el Monte (8)Sonoma (8)Santee (8)San Bruno (8)Paramount (8)Norwalk (8)Montebello (8)Martinez (8)Lakewood (8)La Canada Flintridge (8)Hollywood (8)Hesperia (8)Eastvale (8)Claremont (8)Castro Valley (8)Bellflower (8)West Hills (7)Soquel (7)San Fernando (7)Ridgecrest (7)Reseda (7)Placerville (7)Oroville (7)Orangevale (7)Oakhurst (7)Moorpark (7)Monterey Park (7)Millbrae (7)Loomis (7)Lemon Grove (7)Laguna Beach (7)La Palma (7)La Habra (7)Corte Madera (7)Bonita (7)Artesia (7)Altadena (7)Yreka (6)Valley Village (6)Truckee (6)Stanton (6)Spring Valley (6)South Gate (6)Sonora (6)Sebastopol (6)Rosemead (6)Rolling Hills Estates (6)Porterville (6)Perris (6)Norco (6)Marysville (6)Lynwood (6)Larkspur (6)La Verne (6)Del Mar (6)Coronado (6)Cathedral City (6)Twentynine Palms (5)Sylmar (5)South Pasadena (5)San Marino (5)San Anselmo (5)Pittsburg (5)Panorama City (5)Pacifica (5)Moraga (5)Montrose (5)Marina (5)Malibu (5)Los Banos (5)Lomita (5)Lawndale (5)La Mirada (5)Huntington Park (5)Hollister (5)Daly City (5)Compton (5)Ceres (5)Blythe (5)Beaumont (5)Azusa (5)Arcata (5)Yucca Valley (4)Windsor (4)Wildomar (4)Valley Springs (4)Tiburon (4)Tehachapi (4)South Lake Tahoe (4)Seaside (4)San Pablo (4)Salida (4)Rowland Heights (4)Pine Grove (4)Orinda (4)Ojai (4)Oakdale (4)McKinleyville (4)Madera (4)Lathrop (4)Lakeport (4)La Quinta (4)Half Moon Bay (4)Hacienda Heights (4)Granite Bay (4)Galt (4)Exeter (4)East Palo Alto (4)Duarte (4)Colfax (4)Brawley (4)Bishop (4)Anderson (4)Winnetka (3)Wilmington (3)Wasco (3)Vernon (3)Sun Valley (3)Solvang (3)Shingle Springs (3)Selma (3)San Jacinto (3)Riverbank (3)Reedley (3)Red Bluff (3)Ramona (3)Pinole (3)Pacoima (3)Oakley (3)Newhall (3)Nevada City (3)Mountain House (3)Mariposa (3)March Air Reserve Base (3)Mammoth Lakes (3)Los Osos (3)Lompoc (3)Lincoln (3)Lakeside (3)Laguna Woods (3)Jackson (3)Indio (3)Highland (3)Harbor City (3)Fort Bragg (3)Fallbrook (3)Delano (3)Crescent City (3)Colton (3)Cloverdale (3)Cayucos (3)Carson (3)Carpinteria (3)Calexico (3)Bonny Doon (3)Belvedere Tiburon (3)Bell Gardens (3)Baldwin Park (3)Atwater (3)Arleta (3)Alturas (3)Alpine (3)Albany (3)Woodland Hls (2)Winchester (2)Willows (2)Willits (2)
Showing the 400 cities with the most iT & computer services. Use search to find any other town.
Well-documented iT & computer services in California
A sample of listings with a street address, phone number and website, one per city.
T-Mobile
Verizon
T-Mobile Authorized Retailer
T-Mobile Authorized Retailer
T-Mobile Authorized Retailer
uBreakiFix
OfficeMax Tech Services
AT&T
AT&T
AT&T
AT&T
Still comparing California agencies?
Run a free 60-second checkup on your listing and website first. You'll know exactly what's missing before you talk to anyone.
How to choose an IT company in California
- Ask who will actually do the work and how often you'll hear from them.
- Get the scope, price and timeline in writing.
- Ask for two references from clients like you.
How California businesses get found in Google and AI answers
- Claim and complete your Google Business Profile, then keep hours, photos and services current.
- Use the same business name, address and phone everywhere you are listed, including directories like this one.
- Publish pages that answer the questions customers actually ask, so ChatGPT, Gemini, Perplexity and Google AI Overviews can cite you.
- Add LocalBusiness schema, clear pricing and service pages so AI assistants and booking agents can read your details.
Learn more: SEO vs. AI search optimization · Get found on Google Maps and in AI answers · How to pick an SEO company
Common questions
How many iT & computer services are listed in California?
USA Business Search lists 15,112 iT & computer services across 600 California cities and towns.
Which California cities have the most iT & computer services?
San Francisco (1,358), San Diego (958), Los Angeles (889), San Jose (681), Irvine (604).
How do I choose an IT company in California?
Ask who will actually do the work and how often you'll hear from them. Get the scope, price and timeline in writing.
How do I add or fix a listing?
Listings are free. Use Add your business, or the Claim or fix link on any listing.
What should I ask a California marketing agency before I hire them?
Ask who will actually do the work, how they track calls and forms, and what happens to your accounts if you leave. Eye To Ad Media offers a free review of how your business shows up in Google and AI answers.
What is AI search optimization (AIO or GEO)?
It is the work of making your business easy for AI assistants like ChatGPT, Gemini and Google AI Overviews to understand, trust and recommend: consistent listings, structured data, and pages that answer real customer questions. Read SEO vs. AI search optimization.