Marin, CA Internet Speeds — Measured 2024
Real speed tests run in Marin County, California during 2024 recorded a median download of 116.6 Mbps, upload of 18.2 Mbps and latency of 10.2 ms, across 35,109 measurements. That is 1.4× the US median and places it #142 of 2,425 US counties.
What these numbers mean here
The median is the typical connection, not the best one available. Half the tests in Marin came in below 116.6 Mbps and half above. The slower quarter of connections measured under 42.8 Mbps, while the faster quarter exceeded 261.5 Mbps — a spread that usually reflects a mix of fibre, cable and older DSL lines in the same area rather than one uniform service level.
At 116.6 Mbps down and 18.2 Mbps up, a typical household here can comfortably run several 4K streams alongside video calls. Latency of 10.2 ms is excellent for gaming and real-time calls.
The spread of connections in Marin
Measured download speed, 2024
How California has changed since 2020
Median download by year, California
State-wide measured median, Mbps
How the big providers actually perform
Median measured download speed by provider across the United States. SignalScout does not yet map which of these serve Marin specifically — see how to check availability — but the ranking shows what customers of each really get.
California counties ranked
| # | County | Down | Up | Latency |
|---|---|---|---|---|
| 1 | Marin | 116.6 | 18.2 | 10.2 |
| 2 | Ventura | 115.5 | 19.7 | 9.6 |
| 3 | San Mateo | 106.9 | 23.0 | 8.0 |
| 4 | Sonoma | 104.9 | 20.6 | 10.5 |
| 5 | Orange | 99.5 | 17.6 | 8.6 |
| 6 | San Diego | 98.7 | 19.0 | 11.4 |
| 7 | Kern | 98.6 | 11.7 | 12.4 |
| 8 | Solano | 96.1 | 19.4 | 11.5 |
| 9 | Santa Cruz | 94.2 | 16.3 | 11.6 |
| 10 | Imperial | 93.8 | 11.1 | 13.6 |
| 11 | Santa Barbara | 93.1 | 21.6 | 11.5 |
| 12 | Monterey | 91.6 | 17.1 | 10.9 |
See all 55 counties in California →
Check a specific address in Marin
County figures describe the area. To look up a specific street address and compare it with somewhere else you are considering, use SignalScout directly.
Common questions
What is the average internet speed in Marin, CA?
Speed tests run in Marin during 2024 recorded a median download of 116.6 Mbps, a median upload of 18.2 Mbps and median latency of 10.2 ms, across 35,109 measurements collected by Measurement Lab.
Is internet in Marin faster or slower than the US average?
Faster. The median measured download here is 116.6 Mbps against a US median of 85.2 Mbps, which ranks Marin #142 out of 2,425 counties nationally.
Are these advertised speeds or real ones?
Real ones. These are aggregated results of speed tests run by actual people on their own connections, published in the public domain by Measurement Lab. They reflect the plans residents actually buy, which is typically well below the fastest plan a provider sells.
Which internet providers serve Marin?
SignalScout does not yet map provider availability by address — that data comes from FCC filings that require a registered account for bulk access. The page shows how major national providers perform, and the FCC National Broadband Map lists filed availability by address.
Check a real address
See the measured download, upload and latency for any US address, plus a Connectivity Score ranked against every county in the country.