San Luis Obispo County, CA Cell Phone Coverage Map & Network Rankings (2026)

Find the best cell phone network and plan to use in San Luis Obispo County, CA

Coverage rankings for San Luis Obispo County, CA

T-Mobile currently ranks first for coverage in this area, with a coverage score of 57.9. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.

RankCarrierScoreOverall4G LTE5GFast 5GAverage Signal
1T-Mobile57.955.8%55.7%48.2%35.7% -92 dBm
2AT&T57.867.7%67.7%43.7%39.8% -114 dBm
3Verizon49.365.1%64.8%21.0%14.7% -97 dBm

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

Cell phone coverage map for San Luis Obispo 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 Compare Wireless Carriers.

Loading coverage map...

Cell phone coverage by network in San Luis Obispo County, CA

#1

T-Mobile

Coverage Score 57.9
In San Luis Obispo County, CA
Overall
55.8%
4G LTE
55.7%
5G
48.2%
Fast 5G
35.7%
Average Signal -92 dBm
#2

AT&T

Coverage Score 57.8
In San Luis Obispo County, CA
Overall
67.7%
4G LTE
67.7%
5G
43.7%
Fast 5G
39.8%
Average Signal -114 dBm
#3

Verizon

Coverage Score 49.3
In San Luis Obispo County, CA
Overall
65.1%
4G LTE
64.8%
5G
21.0%
Fast 5G
14.7%
Average Signal -97 dBm
Sponsored US Mobile

Coverage varies by neighborhood. Your carrier shouldn’t.

US Mobile lets you switch between all three major networks, so you can choose the one that works best where you actually use your phone.

Choose your network
Dark Star Light Speed Warp 5G
Unlimited plans from
$22.50/mo
Phone + home internet bundle from
$47/mo
Shop US Mobile

Pricing, network access, switching terms, and home internet availability may vary.

Coverage by city in San Luis Obispo County, CA

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

CityVerizonAT&TT-Mobile
Arroyo Grande, CA 100.0% 100.0% 93.3% 86.7% -83 dBm 100.0% 100.0% 100.0% 97.8% -96 dBm 100.0% 100.0% 100.0% 99.3% -81 dBm
Atascadero, CA 100.0% 100.0% 69.5% 54.9% -91 dBm 92.8% 92.8% 86.4% 83.7% -105 dBm 91.1% 91.1% 85.9% 75.8% -87 dBm
Avila Beach, CA 100.0% 100.0% 23.2% 11.6% -91 dBm 95.7% 95.7% 79.0% 78.3% -106 dBm 95.7% 94.9% 90.6% 73.9% -88 dBm
Blacklake, CA 100.0% 100.0% 95.5% 86.4% -86 dBm 90.9% 90.9% 90.9% 63.6% -114 dBm 100.0% 100.0% 86.4% 40.9% -98 dBm
California Polytechnic State University, CA 100.0% 100.0% 100.0% 97.0% -78 dBm 100.0% 100.0% 100.0% 100.0% -89 dBm 100.0% 100.0% 100.0% 100.0% -74 dBm
Callender, CA 100.0% 100.0% 94.0% 92.0% -79 dBm 100.0% 100.0% 100.0% 98.0% -102 dBm 96.0% 96.0% 84.0% 44.0% -93 dBm
Cambria, CA 92.7% 92.7% 11.4% 7.8% -90 dBm 90.2% 90.2% 71.0% 70.5% -110 dBm 59.1% 59.1% 48.2% 42.0% -86 dBm
Cayucos, CA 97.1% 97.1% 53.6% 42.0% -94 dBm 81.2% 81.2% 72.5% 71.0% -105 dBm 91.3% 91.3% 91.3% 84.1% -80 dBm
Creston, CA 100.0% 100.0% 0.0% 0.0% -84 dBm 100.0% 100.0% 90.9% 81.8% -111 dBm 36.4% 36.4% 0.0% 0.0% -110 dBm
Edna, CA 100.0% 100.0% 61.5% 26.9% -89 dBm 100.0% 100.0% 100.0% 92.3% -91 dBm 100.0% 100.0% 100.0% 100.0% -85 dBm
El Paso de Robles (Paso Robles), CA 100.0% 100.0% 95.3% 90.0% -86 dBm 100.0% 100.0% 98.4% 98.0% -102 dBm 100.0% 100.0% 99.6% 94.4% -85 dBm
Garden Farms, CA 100.0% 100.0% 96.2% 84.6% -93 dBm 100.0% 100.0% 100.0% 100.0% -91 dBm 100.0% 100.0% 100.0% 100.0% -77 dBm
Grover Beach, CA 100.0% 100.0% 100.0% 100.0% -78 dBm 100.0% 100.0% 100.0% 96.4% -91 dBm 100.0% 100.0% 100.0% 100.0% -81 dBm
Lake Nacimiento, CA 74.3% 74.3% 0.4% 0.0% -98 dBm 82.7% 82.7% 66.2% 63.3% -113 dBm 87.3% 87.3% 71.3% 45.6% -95 dBm
Los Berros, CA 100.0% 100.0% 94.6% 91.1% -84 dBm 100.0% 100.0% 100.0% 87.5% -94 dBm 100.0% 100.0% 100.0% 94.6% -83 dBm
Los Osos, CA 100.0% 100.0% 47.6% 34.8% -90 dBm 100.0% 100.0% 95.9% 95.2% -108 dBm 99.3% 99.3% 97.9% 93.1% -82 dBm
Los Ranchos, CA 100.0% 100.0% 69.7% 43.9% -90 dBm 100.0% 100.0% 93.9% 90.9% -104 dBm 100.0% 100.0% 97.0% 89.4% -85 dBm
Morro Bay, CA 100.0% 100.0% 88.7% 79.8% -86 dBm 97.6% 97.6% 96.8% 91.1% -100 dBm 97.6% 97.6% 97.6% 97.6% -74 dBm
Nipomo, CA 100.0% 100.0% 97.7% 91.1% -85 dBm 100.0% 100.0% 96.8% 79.0% -107 dBm 99.4% 99.4% 97.7% 91.9% -82 dBm
Oak Shores, CA 58.6% 58.6% 0.0% 0.0% -97 dBm 98.3% 98.3% 82.8% 81.9% -112 dBm 88.8% 88.8% 78.4% 56.9% -93 dBm
Oceano, CA 100.0% 100.0% 100.0% 97.3% -84 dBm 100.0% 100.0% 100.0% 97.3% -97 dBm 100.0% 100.0% 100.0% 100.0% -84 dBm
Paso Robles, CA 73.5% 73.1% 34.7% 26.3% -96 dBm 80.5% 80.5% 65.0% 61.0% -113 dBm 68.1% 68.0% 57.7% 42.4% -91 dBm
Pismo Beach, CA 100.0% 100.0% 87.7% 82.7% -82 dBm 98.8% 98.8% 96.3% 96.3% -95 dBm 98.8% 98.8% 95.1% 87.7% -83 dBm
San Luis Obispo, CA 100.0% 100.0% 97.1% 93.2% -80 dBm 99.4% 99.4% 99.4% 98.7% -97 dBm 100.0% 100.0% 100.0% 99.4% -80 dBm
San Miguel, CA 100.0% 100.0% 100.0% 97.6% -84 dBm 100.0% 100.0% 100.0% 100.0% -92 dBm 100.0% 100.0% 100.0% 100.0% -73 dBm
San Simeon, CA 72.2% 72.2% 0.0% 0.0% -92 dBm 72.2% 72.2% 72.2% 72.2% -115 dBm 77.8% 77.8% 77.8% 61.1% -79 dBm
Santa Margarita, CA 100.0% 100.0% 100.0% 69.2% -105 dBm 100.0% 100.0% 100.0% 100.0% -103 dBm 100.0% 100.0% 100.0% 84.6% -89 dBm
Shandon, CA 100.0% 100.0% 95.7% 88.4% -83 dBm 100.0% 100.0% 98.6% 98.6% -101 dBm 100.0% 100.0% 98.6% 92.8% -78 dBm
Templeton, CA 100.0% 100.0% 80.6% 58.9% -91 dBm 100.0% 100.0% 98.9% 98.3% -108 dBm 100.0% 100.0% 100.0% 98.3% -81 dBm
Whitley Gardens, CA 100.0% 100.0% 96.8% 80.6% -83 dBm 96.8% 96.8% 77.4% 77.4% -112 dBm 93.5% 93.5% 87.1% 80.6% -84 dBm
Woodlands, CA 100.0% 100.0% 100.0% 97.3% -88 dBm 100.0% 100.0% 100.0% 100.0% -107 dBm 97.3% 97.3% 83.8% 62.2% -92 dBm
Fellows, CA 100.0% 100.0% 87.5% 0.0% -100 dBm 100.0% 100.0% 93.8% 87.5% -120 dBm 100.0% 100.0% 100.0% 100.0% -79 dBm
Santa Maria, CA 100.0% 100.0% 99.8% 97.6% -77 dBm 100.0% 100.0% 99.4% 90.5% -97 dBm 100.0% 100.0% 100.0% 99.8% -81 dBm

About The Coverage Data

Coverage and signal estimates are derived by Compare Wireless Carriers 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 San Luis Obispo 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.