FCC Data · Updated April 2026
Illinois Internet Overview
825 Mbps avg · 1396 ZIP codes · 98% fiber · 102 counties
825
Avg Mbps
98%
Fiber Access
10
Avg Providers
1,396
ZIP Codes
County Grade Distribution
A
32
B
35
C
34
D
1
F
0
Best Broadband Counties in Illinois
| County | Grade | Avg Download | Fiber | ZIPs |
|---|---|---|---|---|
| DeKalb | A | 1000 Mbps | 100% | 13 |
| Kendall | A | 1000 Mbps | 100% | 8 |
| McDonough | A | 1000 Mbps | 100% | 10 |
| McLean | A | 1000 Mbps | 100% | 24 |
| Adams | A | 1000 Mbps | 100% | 16 |
| Clay | A | 1000 Mbps | 100% | 7 |
| Brown | A | 1000 Mbps | 100% | 3 |
| Wabash | A | 1000 Mbps | 100% | 4 |
| Fulton | A | 1000 Mbps | 100% | 20 |
| Kane | A | 1000 Mbps | 100% | 22 |
| Richland | A | 1000 Mbps | 100% | 6 |
| Warren | A | 1000 Mbps | 100% | 8 |
| Christian | A | 1000 Mbps | 100% | 14 |
| Tazewell | A | 1000 Mbps | 100% | 16 |
| Hancock | A | 1000 Mbps | 100% | 16 |
Slowest Counties in Illinois
| County | Grade | Avg Download | Fiber | ZIPs |
|---|---|---|---|---|
| Fayette | D | 1000 Mbps | 100% | 9 |
| Cass | C | 1000 Mbps | 100% | 6 |
| Menard | C | 1000 Mbps | 100% | 5 |
| Calhoun | C | 1000 Mbps | 100% | 6 |
| Cumberland | C | 1000 Mbps | 100% | 5 |
| Greene | C | 1000 Mbps | 100% | 10 |
| Washington | C | 100 Mbps | 100% | 10 |
| Clark | C | 100 Mbps | 100% | 7 |
| Bond | C | 100 Mbps | 100% | 8 |
| Union | C | 100 Mbps | 100% | 7 |
| Massac | C | 100 Mbps | 100% | 5 |
| Putnam | C | 100 Mbps | 100% | 7 |
| Marshall | C | 1000 Mbps | 100% | 8 |
| Perry | C | 1000 Mbps | 100% | 6 |
| Carroll | C | 1000 Mbps | 100% | 7 |
All 102 Counties in Illinois
ADeKalb
AKendall
AMcDonough
AMcLean
AAdams
AClay
ABrown
AWabash
AFulton
AKane
ARichland
AWarren
AChristian
ATazewell
AHancock
AEffingham
AHenderson
APiatt
AChampaign
AEdwards
AWayne
AHardin
AStark
AMarion
ASchuyler
AFord
APeoria
ASangamon
ACook
AMorgan
AMonroe
APope
BMontgomery
BScott
BKnox
BMason
BWill
BJo Daviess
BMadison
BJersey
BPike
BHenry
BHamilton
BDuPage
BSt. Clair
BJohnson
BMoultrie
BRock Island
BWilliamson
BLake
BGallatin
BWoodford
BSaline
BMcHenry
BMercer
BJasper
BKankakee
BBoone
BMacon
BGrundy
BWinnebago
BLogan
BVermilion
BWhiteside
BDe Witt
BRandolph
BJackson
CLaSalle
CStephenson
CFranklin
CLivingston
CIroquois
CDouglas
CColes
CShelby
CClinton
COgle
CCrawford
CLee
CMacoupin
CPulaski
CBureau
CCarroll
CEdgar
CLawrence
CJefferson
CWhite
CAlexander
CMarshall
CPerry
CPutnam
CBond
CUnion
CMassac
CGreene
CWashington
CClark
CCumberland
CCalhoun
CCass
CMenard
DFayette
Internet Providers in Illinois
| Provider | ZIP Codes | Max Speed |
|---|---|---|
| T-Mobile | 1,396 | 25 Mbps |
| Comcast (Xfinity) | 1,396 | 2,000 Mbps |
| AT&T | 1,396 | 1,000 Mbps |
| United States Cellular Corporation | 1,396 | 2 Mbps |
| Frontier Communications | 1,396 | 1,000 Mbps |
| King Street L.p. | 1,396 | 10 Mbps |
| Rise Broadband | 1,396 | 250 Mbps |
| Wisper Isp, LLC | 1,396 | 100 Mbps |
Cities in Illinois
Neighboring States
Test Your Speed
See how your connection compares to the 825 Mbps average in Illinois.
Frequently Asked Questions
What is the average internet speed in Illinois?
Illinois has an average maximum download speed of 825 Mbps across 1396 ZIP codes. 98% of areas have fiber internet access, and the state averages 10 providers per ZIP code.
Which counties in Illinois have the best internet?
The counties with the best broadband in Illinois include DeKalb (Grade A), Kendall (Grade A), McDonough (Grade A). These areas have the fastest average speeds and most provider competition.
How does Illinois compare to the national average?
The national average download speed is 876 Mbps, while Illinois averages 825 Mbps — below the national average. Nationally, 96% of areas have fiber, compared to 98% in Illinois.
Sources: FCC Broadband Data Collection