Piatt County, IL Cell Phone Coverage Map & Network Rankings (2026)

Find the best cell phone network and plan to use in Piatt County, IL

Coverage rankings for Piatt County, IL

T-Mobile currently ranks first for coverage in this area, with a coverage score of 89.6. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.

RankCarrierScoreOverall4G LTE5GFast 5GAverage Signal
1T-Mobile89.697.0%97.0%89.8%65.0% -92 dBm
2AT&T89.299.8%99.8%98.5%75.7% -109 dBm
3Verizon85.499.7%99.7%66.4%50.3% -89 dBm

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

Cell phone coverage map for Piatt County, IL

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.

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Cell phone coverage by network in Piatt County, IL

#1

T-Mobile

Coverage Score 89.6
In Piatt County, IL
Overall
97.0%
4G LTE
97.0%
5G
89.8%
Fast 5G
65.0%
Average Signal -92 dBm
#2

AT&T

Coverage Score 89.2
In Piatt County, IL
Overall
99.8%
4G LTE
99.8%
5G
98.5%
Fast 5G
75.7%
Average Signal -109 dBm
#3

Verizon

Coverage Score 85.4
In Piatt County, IL
Overall
99.7%
4G LTE
99.7%
5G
66.4%
Fast 5G
50.3%
Average Signal -89 dBm
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Coverage by city in Piatt County, IL

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

CityVerizonAT&TT-Mobile
Atwood, IL 100.0% 100.0% 100.0% 92.3% -85 dBm 100.0% 100.0% 100.0% 100.0% -87 dBm 100.0% 100.0% 100.0% 100.0% -84 dBm
Bement, IL 100.0% 100.0% 33.3% 0.0% -82 dBm 100.0% 100.0% 100.0% 95.2% -110 dBm 19.0% 19.0% 4.8% 0.0% -108 dBm
Cerro Gordo, IL 100.0% 100.0% 47.1% 29.4% -96 dBm 100.0% 100.0% 100.0% 94.1% -93 dBm 100.0% 100.0% 100.0% 100.0% -72 dBm
Cisco, IL 100.0% 100.0% 50.0% 0.0% -98 dBm 100.0% 100.0% 100.0% 100.0% -95 dBm 100.0% 100.0% 100.0% 100.0% -88 dBm
De Land, IL 100.0% 100.0% 100.0% 100.0% -73 dBm 100.0% 100.0% 100.0% 18.2% -116 dBm 54.5% 54.5% 45.5% 0.0% -102 dBm
Hammond, IL 100.0% 100.0% 0.0% 0.0% -74 dBm 100.0% 100.0% 100.0% 100.0% -112 dBm 100.0% 100.0% 89.5% 47.4% -97 dBm
LaPlace, IL 100.0% 100.0% 64.7% 11.8% -97 dBm 100.0% 100.0% 100.0% 100.0% -118 dBm 100.0% 100.0% 100.0% 100.0% -70 dBm
Mansfield, IL 100.0% 100.0% 100.0% 100.0% -78 dBm 100.0% 100.0% 100.0% 100.0% -91 dBm 92.3% 92.3% 84.6% 53.8% -99 dBm
Monticello, IL 100.0% 100.0% 93.5% 77.6% -86 dBm 100.0% 100.0% 100.0% 96.3% -96 dBm 100.0% 100.0% 98.1% 89.7% -85 dBm
White Heath, IL 100.0% 100.0% 100.0% 100.0% -76 dBm 100.0% 100.0% 100.0% 100.0% -103 dBm 100.0% 100.0% 100.0% 87.5% -90 dBm
Ivesdale, IL 100.0% 100.0% 82.4% 0.0% -101 dBm 100.0% 100.0% 100.0% 29.4% -118 dBm 94.1% 94.1% 35.3% 0.0% -106 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 Piatt County, IL 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.