Jefferson, MO Internet Speeds — Measured 2024
Real speed tests run in Jefferson County, Missouri during 2024 recorded a median download of 110.3 Mbps, upload of 11.7 Mbps and latency of 13.9 ms, across 13,809 measurements. That is 1.3× the US median and places it #236 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 Jefferson came in below 110.3 Mbps and half above. The slower quarter of connections measured under 37.0 Mbps, while the faster quarter exceeded 276.1 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 110.3 Mbps down and 11.7 Mbps up, a typical household here can comfortably run several 4K streams alongside video calls. Latency of 13.9 ms is excellent for gaming and real-time calls.
The spread of connections in Jefferson
Measured download speed, 2024
How Missouri has changed since 2020
Median download by year, Missouri
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 Jefferson specifically — see how to check availability — but the ranking shows what customers of each really get.
Missouri counties ranked
| # | County | Down | Up | Latency |
|---|---|---|---|---|
| 1 | Buchanan | 133.7 | 31.8 | 34.0 |
| 2 | Cape Girardeau | 123.5 | 14.8 | 15.9 |
| 3 | Scott | 120.5 | 18.9 | 17.5 |
| 4 | Callaway | 119.0 | 72.4 | 29.8 |
| 5 | Clay | 112.7 | 28.8 | 30.0 |
| 6 | Audrain | 112.2 | 11.2 | 26.9 |
| 7 | Jefferson | 110.3 | 11.7 | 13.9 |
| 8 | St. Francois | 106.2 | 11.0 | 15.2 |
| 9 | Adair | 104.2 | 19.2 | 55.0 |
| 10 | St. Charles | 104.0 | 18.1 | 13.3 |
| 11 | Lincoln | 103.3 | 17.0 | 14.7 |
| 12 | Marion | 94.1 | 11.2 | 17.7 |
See all 79 counties in Missouri →
Check a specific address in Jefferson
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 Jefferson, MO?
Speed tests run in Jefferson during 2024 recorded a median download of 110.3 Mbps, a median upload of 11.7 Mbps and median latency of 13.9 ms, across 13,809 measurements collected by Measurement Lab.
Is internet in Jefferson faster or slower than the US average?
Faster. The median measured download here is 110.3 Mbps against a US median of 85.2 Mbps, which ranks Jefferson #236 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 Jefferson?
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.