Carrierlytics County Coverage Guide

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

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

Using FCC mobile coverage data across cities and ZIP codes in McHenry County, IL, Carrierlytics compares the top-performing networks and the cheapest plans that use them.

McHenry County, IL

Cell phone coverage map for McHenry 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 Carrierlytics.

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Cell phone coverage rankings by network in McHenry County, IL

#1

T-Mobile

Coverage Score 95.9
In McHenry County, IL
Overall
99.6%
4G LTE
99.6% avg. -86 dBm 4G LTE signal where 4G LTE coverage exists: avg. -86 dBm
5G
98.4% avg. -83 dBm 5G signal where 5G coverage exists: avg. -83 dBm
Fast 5G
89.9% avg. -82 dBm Fast 5G signal where Fast 5G coverage exists: avg. -82 dBm
#2

Verizon

Coverage Score 91.9
In McHenry County, IL
Overall
100.0%
4G LTE
100.0% avg. -85 dBm 4G LTE signal where 4G LTE coverage exists: avg. -85 dBm
5G
97.7% avg. -91 dBm 5G signal where 5G coverage exists: avg. -91 dBm
Fast 5G
83.5% avg. -89 dBm Fast 5G signal where Fast 5G coverage exists: avg. -89 dBm
#3

AT&T

Coverage Score 78.7
In McHenry County, IL
Overall
99.8%
4G LTE
99.7% avg. -102 dBm 4G LTE signal where 4G LTE coverage exists: avg. -102 dBm
5G
93.6% avg. -108 dBm 5G signal where 5G coverage exists: avg. -108 dBm
Fast 5G
77.3% avg. -107 dBm Fast 5G signal where Fast 5G coverage exists: avg. -107 dBm
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Coverage by city in McHenry County, IL

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

City Verizon AT&T T-Mobile
Alden, IL 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0%
Algonquin, IL 100.0% 100.0% 98.3% 90.4% 100.0% 100.0% 100.0% 76.2% 100.0% 100.0% 100.0% 100.0%
Big Foot Prairie, IL 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 83.3% 83.3% 100.0% 100.0% 100.0% 100.0%
Bull Valley, IL 100.0% 100.0% 97.0% 75.8% 99.2% 98.7% 88.6% 63.6% 97.0% 97.0% 89.4% 78.0%
Burtons Bridge, IL 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0%
Cary, IL 100.0% 100.0% 100.0% 97.5% 100.0% 100.0% 99.4% 65.2% 100.0% 100.0% 100.0% 99.4%
Chemung, IL 100.0% 100.0% 85.7% 57.1% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 28.6%
Coral, IL 100.0% 100.0% 100.0% 0.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0%
Crystal Lake, IL 100.0% 100.0% 99.8% 96.5% 100.0% 100.0% 99.8% 73.1% 100.0% 100.0% 100.0% 100.0%
Fox River Grove, IL 100.0% 100.0% 100.0% 97.6% 100.0% 100.0% 100.0% 88.1% 100.0% 100.0% 100.0% 95.2%
Franklinville, IL 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 75.0% 100.0% 100.0% 100.0% 100.0%
Greenwood, IL 100.0% 100.0% 86.4% 36.4% 100.0% 100.0% 97.0% 78.8% 97.0% 97.0% 87.9% 63.6%
Harmony, IL 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0%
Hartland, IL 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 87.5% 100.0% 100.0% 75.0% 37.5%
Harvard, IL 100.0% 100.0% 100.0% 90.6% 100.0% 100.0% 97.0% 95.1% 100.0% 100.0% 100.0% 99.5%
Hebron, IL 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 96.0% 100.0% 100.0% 100.0% 100.0%
Holiday Hills, IL 100.0% 100.0% 100.0% 89.5% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0%
Huntley, IL 100.0% 100.0% 100.0% 99.4% 100.0% 100.0% 100.0% 69.7% 100.0% 100.0% 100.0% 93.8%
Island Lake, IL 100.0% 100.0% 100.0% 93.9% 100.0% 100.0% 98.8% 64.6% 100.0% 100.0% 100.0% 100.0%
Johnsburg, IL 100.0% 100.0% 100.0% 86.1% 100.0% 99.4% 91.7% 56.1% 100.0% 100.0% 100.0% 95.0%
Lake In The Hills, IL 100.0% 100.0% 100.0% 99.2% 100.0% 100.0% 100.0% 63.9% 100.0% 100.0% 100.0% 100.0%
Lakemoor, IL 100.0% 100.0% 100.0% 88.6% 100.0% 100.0% 100.0% 82.9% 100.0% 100.0% 100.0% 100.0%
Lakewood Census Place 1741651, IL 100.0% 100.0% 99.1% 95.3% 100.0% 100.0% 100.0% 76.6% 100.0% 100.0% 100.0% 98.1%
Lawrence, IL 100.0% 100.0% 100.0% 50.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0%
Marengo, IL 100.0% 100.0% 100.0% 96.3% 100.0% 100.0% 100.0% 99.1% 100.0% 100.0% 98.2% 94.5%
McCullom Lake, IL 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 33.3% 100.0% 100.0% 100.0% 100.0%
Mchenry, IL 100.0% 100.0% 99.7% 94.5% 100.0% 99.7% 100.0% 88.8% 100.0% 100.0% 100.0% 99.7%
Oakwood Hills, IL 100.0% 100.0% 100.0% 84.0% 100.0% 100.0% 100.0% 56.0% 100.0% 100.0% 100.0% 100.0%
Pistakee Highlands, IL 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 85.3% 58.8% 100.0% 100.0% 100.0% 100.0%
Prairie Grove, IL 100.0% 100.0% 100.0% 89.3% 100.0% 100.0% 100.0% 74.5% 100.0% 100.0% 100.0% 98.7%
Richmond, IL 100.0% 100.0% 98.1% 84.1% 100.0% 100.0% 75.7% 72.0% 100.0% 100.0% 100.0% 90.7%
Ridgefield, IL 100.0% 100.0% 100.0% 85.7% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0%
Riley, IL 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 50.0%
Ringwood, IL 100.0% 100.0% 100.0% 89.2% 100.0% 98.9% 100.0% 51.6% 100.0% 100.0% 100.0% 100.0%
Solon Mills, IL 100.0% 100.0% 100.0% 75.0% 100.0% 100.0% 25.0% 0.0% 100.0% 100.0% 100.0% 100.0%
Spring Grove, IL 100.0% 100.0% 86.1% 67.7% 100.0% 100.0% 81.2% 72.6% 100.0% 100.0% 99.1% 94.2%
Trout Valley, IL 100.0% 100.0% 100.0% 60.0% 100.0% 100.0% 100.0% 30.0% 100.0% 100.0% 100.0% 100.0%
Union, IL 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0%
Wonder Lake, IL 100.0% 100.0% 89.3% 51.6% 100.0% 100.0% 100.0% 91.8% 100.0% 100.0% 100.0% 89.3%
Woodstock, IL 100.0% 100.0% 99.7% 77.9% 100.0% 100.0% 99.4% 85.4% 100.0% 100.0% 100.0% 100.0%
Barrington Hills, IL 100.0% 100.0% 91.7% 56.9% 100.0% 100.0% 91.4% 60.8% 96.8% 96.8% 88.1% 56.5%
Fox Lake, IL 100.0% 100.0% 100.0% 89.7% 100.0% 100.0% 99.0% 88.1% 100.0% 100.0% 100.0% 100.0%
Garden Prairie, IL 100.0% 100.0% 66.7% 46.7% 100.0% 100.0% 80.0% 66.7% 100.0% 100.0% 100.0% 86.7%
Gilberts, IL 100.0% 100.0% 100.0% 99.3% 100.0% 100.0% 100.0% 56.0% 100.0% 100.0% 100.0% 100.0%
Hampshire, IL 100.0% 100.0% 99.6% 96.7% 100.0% 100.0% 99.6% 88.6% 100.0% 100.0% 100.0% 91.4%
Lake Barrington, IL 100.0% 100.0% 99.3% 75.7% 100.0% 100.0% 96.5% 66.0% 100.0% 100.0% 100.0% 87.5%
Port Barrington, IL 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 83.3% 100.0% 100.0% 100.0% 100.0%

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 McHenry 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.