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Illinois Internet Speeds by County (2024)

Measured internet performance across all 84 counties in Illinois with enough speed tests to report. The state median download in 2024 was 85.0 Mbps, against a US median of 85.2 Mbps.

Counties covered

Fastest county

Richland

Fastest median

115.6 Mbps

Slowest median

14.4 Mbps

Every county ranked by measured download speed

#	County	Down	Up	ms	Tests
1	Richland	115.6	28.6	16.2	895
2	Kendall	107.0	23.9	9.5	6,719
3	DuPage	105.9	21.5	8.1	114,468
4	Lake	104.5	19.8	8.4	77,047
5	Kane	103.0	22.7	9.5	37,068
6	Jefferson	102.7	11.3	16.0	1,366
7	Will	101.7	20.6	9.0	46,605
8	Hamilton	101.3	45.4	16.0	580
9	Clay	100.6	74.4	18.6	1,634
10	Rock Island	99.3	29.8	13.6	7,305
11	Madison	98.9	11.2	14.3	16,669
12	St. Clair	97.7	11.1	14.5	16,839
13	Winnebago	97.7	15.9	10.3	19,478
14	Fulton	97.1	22.1	17.8	1,179
15	Johnson	96.6	75.1	19.4	601
16	Tazewell	94.7	22.1	11.8	6,319
17	McDonough	93.9	15.8	14.3	1,457
18	Sangamon	93.8	22.1	12.6	9,610
19	Whiteside	93.3	22.5	13.9	3,122
20	DeKalb	93.1	22.4	10.7	6,073
21	Champaign	92.5	23.6	10.0	17,286
22	Vermilion	92.2	19.9	17.3	3,582
23	Wayne	91.8	25.5	16.3	394
24	Adams	90.5	40.8	14.9	2,298
25	Effingham	90.5	30.5	16.9	2,037
26	Peoria	90.5	23.4	11.6	12,099
27	Macon	89.3	20.8	12.3	6,334
28	Douglas	89.2	17.0	10.5	1,824
29	Perry	88.8	27.0	17.6	451
30	McHenry	88.7	17.5	10.4	36,450
31	McLean	87.6	22.5	14.1	12,003
32	Kankakee	87.4	20.0	9.9	4,626
33	Macoupin	87.4	29.8	15.0	2,703
34	Clinton	87.3	10.3	16.0	658
35	Knox	84.4	20.9	16.4	2,576
36	Livingston	84.4	24.7	9.7	2,028
37	Stephenson	82.4	14.9	14.8	3,590
38	Moultrie	79.3	50.7	8.3	567
39	Jo Daviess	79.0	30.3	20.5	1,297
40	Cook	77.8	12.4	8.7	918,586
41	Boone	74.6	21.1	13.8	2,156
42	Edgar	74.2	21.6	20.0	888
43	LaSalle	74.1	18.2	13.7	6,154
44	Randolph	72.8	21.5	16.1	1,276
45	Henry	72.7	28.5	18.9	2,874
46	Monroe	71.2	9.5	17.6	2,633
47	Grundy	71.1	18.5	9.3	1,716
48	Menard	70.5	48.9	18.4	661
49	Morgan	69.0	22.2	14.9	2,068
50	Clark	68.7	14.3	11.5	705
51	Piatt	68.7	26.4	11.7	807
52	Christian	68.6	51.2	16.8	1,388
53	Crawford	68.5	16.4	11.8	1,097
54	Mason	67.6	51.2	18.1	492
55	White	67.6	17.5	18.2	510
56	Franklin	66.8	18.2	19.6	1,623
57	Mercer	66.8	12.1	15.0	822
58	Marion	66.2	10.4	18.6	1,337
59	Montgomery	65.6	31.2	14.7	1,410
60	Lee	64.8	14.2	13.6	1,365
61	Union	64.7	18.1	15.5	382
62	Saline	62.3	13.1	18.6	762
63	Coles	62.2	26.5	13.1	3,802
64	De Witt	61.9	20.8	13.8	1,423
65	Woodford	60.9	19.0	13.2	2,451
66	Putnam	60.7	16.4	11.2	374
67	Jersey	58.8	18.9	16.0	1,445
68	Jackson	58.6	16.4	19.1	3,657
69	Logan	49.0	12.4	12.3	906
70	Fayette	46.6	14.1	21.1	1,008
71	Williamson	46.1	11.8	30.2	5,906
72	Warren	46.0	9.2	17.5	553
73	Massac	42.8	11.7	23.0	376
74	Cass	40.7	5.0	20.2	858
75	Ogle	35.3	9.9	13.6	1,706
76	Iroquois	33.2	9.7	18.4	827
77	Carroll	30.6	7.3	14.8	453
78	Pike	29.0	6.0	23.0	713
79	Bond	25.8	8.6	19.7	457
80	Bureau	23.1	3.9	15.2	804
81	Lawrence	22.1	3.2	25.7	359
82	Ford	20.7	11.9	9.4	539
83	Shelby	18.2	2.7	18.1	727
84	Greene	14.4	2.1	27.4	414

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