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DSDownloadSpeed
FCC Data · Updated April 2026

California Internet Overview

946 Mbps avg · 1803 ZIP codes · 96% fiber · 58 counties

946
Avg Mbps
96%
Fiber Access
10
Avg Providers
1,803
ZIP Codes
Counties

County Grade Distribution

A
17
B
29
C
9
D
3
F
0
Best

Best Broadband Counties in California

CountyGradeAvg DownloadFiberZIPs
San MateoA1000 Mbps100%30
San BernardinoA1000 Mbps100%91
San FranciscoA1000 Mbps100%28
AlamedaA1000 Mbps100%49
RiversideA1000 Mbps100%71
VenturaA1000 Mbps100%29
Los AngelesA1000 Mbps100%295
PlacerA1000 Mbps100%30
Contra CostaA1000 Mbps100%43
OrangeA1000 Mbps100%88
Santa ClaraA1000 Mbps100%58
MarinA1000 Mbps100%29
Santa CruzA1000 Mbps100%17
YoloA1000 Mbps100%18
MonoA1000 Mbps100%8
Needs Improvement

Slowest Counties in California

CountyGradeAvg DownloadFiberZIPs
AlpineD100 Mbps0%3
SierraD1000 Mbps100%8
ModocD100 Mbps100%11
AmadorC100 Mbps100%11
PlumasC1000 Mbps100%16
TrinityC100 Mbps0%13
LassenC1000 Mbps100%16
TehamaC1000 Mbps100%14
KingsC1000 Mbps100%8
CalaverasC100 Mbps100%18
ImperialC1000 Mbps100%15
LakeC100 Mbps0%14
MariposaB1000 Mbps100%8
MendocinoB100 Mbps100%26
Del NorteB100 Mbps0%5
Browse

All 58 Counties in California

ASan Mateo
1000 Mbps · 100% fiber
ASan Bernardino
1000 Mbps · 100% fiber
ASan Francisco
1000 Mbps · 100% fiber
AAlameda
1000 Mbps · 100% fiber
ARiverside
1000 Mbps · 100% fiber
AVentura
1000 Mbps · 100% fiber
ALos Angeles
1000 Mbps · 100% fiber
APlacer
1000 Mbps · 100% fiber
AContra Costa
1000 Mbps · 100% fiber
AOrange
1000 Mbps · 100% fiber
ASanta Clara
1000 Mbps · 100% fiber
AMarin
1000 Mbps · 100% fiber
ASanta Cruz
1000 Mbps · 100% fiber
AYolo
1000 Mbps · 100% fiber
AMono
1000 Mbps · 100% fiber
ASacramento
1000 Mbps · 100% fiber
AButte
1000 Mbps · 100% fiber
BSan Diego
1000 Mbps · 100% fiber
BNapa
1000 Mbps · 100% fiber
BSonoma
1000 Mbps · 100% fiber
BFresno
1000 Mbps · 100% fiber
BMonterey
1000 Mbps · 100% fiber
BSan Joaquin
1000 Mbps · 100% fiber
BKern
1000 Mbps · 100% fiber
BSolano
1000 Mbps · 100% fiber
BStanislaus
1000 Mbps · 100% fiber
BSanta Barbara
1000 Mbps · 100% fiber
BSutter
1000 Mbps · 100% fiber
BColusa
1000 Mbps · 100% fiber
BSan Benito
1000 Mbps · 100% fiber
BSiskiyou
1000 Mbps · 100% fiber
BNevada
1000 Mbps · 100% fiber
BYuba
1000 Mbps · 100% fiber
BMerced
1000 Mbps · 100% fiber
BInyo
1000 Mbps · 100% fiber
BTulare
1000 Mbps · 100% fiber
BSan Luis Obispo
1000 Mbps · 100% fiber
BTuolumne
1000 Mbps · 100% fiber
BEl Dorado
1000 Mbps · 100% fiber
BMadera
1000 Mbps · 100% fiber
BHumboldt
1000 Mbps · 0% fiber
BShasta
1000 Mbps · 100% fiber
BMariposa
1000 Mbps · 100% fiber
BMendocino
100 Mbps · 100% fiber
BDel Norte
100 Mbps · 0% fiber
BGlenn
100 Mbps · 100% fiber
CImperial
1000 Mbps · 100% fiber
CLake
100 Mbps · 0% fiber
CKings
1000 Mbps · 100% fiber
CCalaveras
100 Mbps · 100% fiber
CTehama
1000 Mbps · 100% fiber
CLassen
1000 Mbps · 100% fiber
CTrinity
100 Mbps · 0% fiber
CAmador
100 Mbps · 100% fiber
CPlumas
1000 Mbps · 100% fiber
DModoc
100 Mbps · 100% fiber
DSierra
1000 Mbps · 100% fiber
DAlpine
100 Mbps · 0% fiber
Providers

Internet Providers in California

ProviderZIP CodesMax Speed
T-Mobile1,80325 Mbps
Charter (Spectrum)1,8031,000 Mbps
Comcast (Xfinity)1,8032,000 Mbps
AT&T1,8031,000 Mbps
Verizon1,8031,000 Mbps
unWired Broadband INC1,80330 Mbps
Etheric Networks, INC.1,803300 Mbps
Cal.net INC.1,803100 Mbps
Cities

Cities in California

Neighbors

Neighboring States

Test Your Speed

See how your connection compares to the 946 Mbps average in California.

FAQ

Frequently Asked Questions

What is the average internet speed in California?

California has an average maximum download speed of 946 Mbps across 1803 ZIP codes. 96% of areas have fiber internet access, and the state averages 10 providers per ZIP code.

Which counties in California have the best internet?

The counties with the best broadband in California include San Mateo (Grade A), San Bernardino (Grade A), San Francisco (Grade A). These areas have the fastest average speeds and most provider competition.

How does California compare to the national average?

The national average download speed is 876 Mbps, while California averages 946 Mbps — above the national average. Nationally, 96% of areas have fiber, compared to 96% in California.