Colusa County, CA Cell Phone Coverage Map & Network Rankings (2026)

Find the best cell phone network and plan to use in Colusa County, CA

Coverage rankings for Colusa County, CA

T-Mobile currently ranks first for coverage in this area, with a coverage score of 61.7. Carrierlytics uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.

Rank Carrier Score Overall 4G LTE 5G Fast 5G Average Signal
1 T-Mobile 61.7 59.2% 59.2% 53.2% 41.3% -93 dBm
2 AT&T 59.8 72.5% 72.1% 60.9% 29.9% -114 dBm
3 Verizon 52.7 66.1% 66.0% 31.7% 17.8% -97 dBm

Scores include coverage area, network type, and average signal strength.

Cell phone coverage map for Colusa County, CA

Zoom in for local detail. Tap or click a colored area to see coverage and signal details. On mobile, use two fingers to move the map.

Coverage Key
Less covered More covered
Darker areas mean the carrier covers more of that location.

Map data © OpenStreetMap contributors, © CARTO. Rendered with MapLibre. FCC BDC mobile coverage processed by Carrierlytics.

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Cell phone coverage by network in Colusa County, CA

#1

T-Mobile

Coverage Score 61.7
In Colusa County, CA
Overall
59.2%
4G LTE
59.2%
5G
53.2%
Fast 5G
41.3%
Average Signal -93 dBm
#2

AT&T

Coverage Score 59.8
In Colusa County, CA
Overall
72.5%
4G LTE
72.1%
5G
60.9%
Fast 5G
29.9%
Average Signal -114 dBm
#3

Verizon

Coverage Score 52.7
In Colusa County, CA
Overall
66.1%
4G LTE
66.0%
5G
31.7%
Fast 5G
17.8%
Average Signal -97 dBm
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Coverage by city in Colusa County, CA

Cities and towns are shown for county-level comparison. Coverage percentages use land-area only coverage.

City Verizon AT&T T-Mobile
Arbuckle, CA 100.0% 100.0% 95.3% 93.0% -79 dBm 100.0% 100.0% 100.0% 93.0% -93 dBm 100.0% 100.0% 100.0% 100.0% -74 dBm
College City, CA 100.0% 100.0% 74.3% 54.3% -94 dBm 100.0% 100.0% 100.0% 72.9% -105 dBm 100.0% 100.0% 100.0% 100.0% -74 dBm
Colusa, CA 100.0% 100.0% 87.4% 83.5% -84 dBm 100.0% 100.0% 100.0% 81.6% -99 dBm 100.0% 100.0% 100.0% 100.0% -75 dBm
Grimes, CA 100.0% 100.0% 0.0% 0.0% -97 dBm 98.2% 96.4% 94.6% 44.6% -115 dBm 100.0% 100.0% 100.0% 100.0% -71 dBm
Lodoga, CA 39.8% 39.8% 0.0% 0.0% -100 dBm 98.8% 98.8% 75.9% 74.7% -113 dBm N/A N/A N/A N/A N/A
Maxwell, CA 100.0% 100.0% 100.0% 98.2% -80 dBm 100.0% 100.0% 100.0% 49.1% -99 dBm 100.0% 100.0% 100.0% 100.0% -67 dBm
Princeton, CA 100.0% 100.0% 0.0% 0.0% -73 dBm 100.0% 100.0% 100.0% 100.0% -96 dBm 97.4% 97.4% 50.0% 0.0% -105 dBm
Stonyford, CA 94.3% 94.3% 0.0% 0.0% -93 dBm 100.0% 100.0% 97.1% 91.4% -113 dBm N/A N/A N/A N/A N/A
Williams, CA 100.0% 100.0% 100.0% 94.8% -79 dBm 100.0% 100.0% 100.0% 81.0% -99 dBm 100.0% 100.0% 100.0% 100.0% -69 dBm

About The Coverage Data

Coverage and signal estimates are derived by Carrierlytics from carrier-reported data in the FCC’s National Broadband Coverage Map, last updated in June 2025. “Percent covered” shows how much of the city or ZIP code area has a carrier signal, whether weak or strong. Signal bars show the estimated average signal strength in areas of Colusa County, CA where that carrier has coverage.

If a carrier says you should have service but you do not, run a challenge test with the FCC Mobile Speed Test App. The FCC uses those results to check carrier-submitted coverage data and requires a carrier response when enough tests show a pattern of inaccurate coverage reporting.