California Internet Overview
946 Mbps avg · 1803 ZIP codes · 96% fiber · 58 counties
County Grade Distribution
Best Broadband Counties in California
| County | Grade | Avg Download | Fiber | ZIPs |
|---|---|---|---|---|
| San Mateo | A | 1000 Mbps | 100% | 30 |
| San Bernardino | A | 1000 Mbps | 100% | 91 |
| San Francisco | A | 1000 Mbps | 100% | 28 |
| Alameda | A | 1000 Mbps | 100% | 49 |
| Riverside | A | 1000 Mbps | 100% | 71 |
| Ventura | A | 1000 Mbps | 100% | 29 |
| Los Angeles | A | 1000 Mbps | 100% | 295 |
| Placer | A | 1000 Mbps | 100% | 30 |
| Contra Costa | A | 1000 Mbps | 100% | 43 |
| Orange | A | 1000 Mbps | 100% | 88 |
| Santa Clara | A | 1000 Mbps | 100% | 58 |
| Marin | A | 1000 Mbps | 100% | 29 |
| Santa Cruz | A | 1000 Mbps | 100% | 17 |
| Yolo | A | 1000 Mbps | 100% | 18 |
| Mono | A | 1000 Mbps | 100% | 8 |
Slowest Counties in California
| County | Grade | Avg Download | Fiber | ZIPs |
|---|---|---|---|---|
| Alpine | D | 100 Mbps | 0% | 3 |
| Sierra | D | 1000 Mbps | 100% | 8 |
| Modoc | D | 100 Mbps | 100% | 11 |
| Amador | C | 100 Mbps | 100% | 11 |
| Plumas | C | 1000 Mbps | 100% | 16 |
| Trinity | C | 100 Mbps | 0% | 13 |
| Lassen | C | 1000 Mbps | 100% | 16 |
| Tehama | C | 1000 Mbps | 100% | 14 |
| Kings | C | 1000 Mbps | 100% | 8 |
| Calaveras | C | 100 Mbps | 100% | 18 |
| Imperial | C | 1000 Mbps | 100% | 15 |
| Lake | C | 100 Mbps | 0% | 14 |
| Mariposa | B | 1000 Mbps | 100% | 8 |
| Mendocino | B | 100 Mbps | 100% | 26 |
| Del Norte | B | 100 Mbps | 0% | 5 |
All 58 Counties in California
Internet Providers in California
| Provider | ZIP Codes | Max Speed |
|---|---|---|
| T-Mobile | 1,803 | 25 Mbps |
| Charter (Spectrum) | 1,803 | 1,000 Mbps |
| Comcast (Xfinity) | 1,803 | 2,000 Mbps |
| AT&T | 1,803 | 1,000 Mbps |
| Verizon | 1,803 | 1,000 Mbps |
| unWired Broadband INC | 1,803 | 30 Mbps |
| Etheric Networks, INC. | 1,803 | 300 Mbps |
| Cal.net INC. | 1,803 | 100 Mbps |
Cities in California
Neighboring States
See how your connection compares to the 946 Mbps average in California.
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.
The this entity record above pulls directly from the FCC Broadband Data Collection (BDC). What follows is the per-entity context — how this entity sits in the broader U.S. internet availability and broadband speed distribution and which underlying factors drive the headline numbers.
The methodology behind every numeric value on this page is publicly documented on the the FCC Broadband Data Collection (BDC) portal and described in detail on this site’s methodology page. Refresh cadence varies by underlying series; the page surfaces the as-of date for each number so readers can trace any figure back to the source release.
Practical use of this page is in combination with the comparison and ranking pages elsewhere on the site, which surface the same data for this entity’s peers within U.S. ZIPs, counties, and states. A single-entity reading without peer context can be misleading when an entity is an outlier on one axis but typical on another.
Source: FCC Broadband Data Collection, 2026.