815 – Illinois Area Codes

Number structure

+1815206
220
223
224
225
226
...
United StatesIllinoisCode of CityNumber

List of area codes

Sort by:
CityArea Code
Amboy815-857
Belvidere815-544, 815-547
Braidwood815-458
Byron815-234
Chenoa815-945
Cissna Park815-457
Clifton815-694
Coal City815-634
Crystal Lake815-356, 815-444, 815-455, 815-459, 815-477, 815-479, 815-788, 815-893
DeKalb815-748, 815-754, 815-756, 815-758, 815-787
Dixon815-284, 815-285, 815-288
Durand815-248
Dwight815-584
Earlville815-246
East Dubuque815-747
Elizabeth815-858
Elwood815-423
Fairbury815-692
Forrest815-657
Forreston815-938
Frankfort815-464, 815-469, 815-806
Freeport815-232, 815-233, 815-235, 815-599
Fulton815-589
Galena815-776, 815-777
Gardner815-237
Genoa815-784
Gilman815-265
Granville815-339
Harvard815-943
Hebron815-648
Herscher815-426
Hinckley815-286
Joliet815-72, 815-730, 815-740, 815-741, 815-744, 815-773, 815-774
Kankakee815-937
Lanark815-493
Lena815-369
Lockport815-588, 815-834, 815-836, 815-838
Manhattan815-478
Manteno815-468
Marengo815-568
Marseilles815-795
McHenry815-344, 815-363, 815-385, 815-578, 815-759
Mendota815-538, 815-539
Milledgeville815-225
Momence815-472
Morris815-416, 815-941, 815-942
Morrison815-772
Mount Carroll815-244
Mount Morris815-734
New Lenox815-462, 815-463, 815-485
Newark815-695
North Utica815-667
Oglesby815-883
Oregon815-732
Ottawa815-431, 815-433, 815-434
Pecatonica815-239
Peru815-220, 815-223, 815-224
Plainfield815-230, 815-254, 815-267, 815-436, 815-439, 815-577, 815-609
Polo815-946
Pontiac815-842, 815-844
Poplar Grove815-765
Princeton815-872, 815-875, 815-879
Prophetstown815-537
Richmond815-678
Rochelle815-561, 815-562
Rockford815-226, 815-227, 815-229, 815-316, 815-332, 815-39, 815-484, 815-489, 815-490, 815-708, 815-874, 815-96, 815-971, 815-977, 815-986, 815-987
Rockton815-624
Romeoville815-293, 815-372, 815-886
Roscoe815-623
Sandwich815-786
Savanna815-273
Seneca815-357
Shabbona815-824
Sheridan815-496
Somonauk815-498
South Beloit815-389
Spring Grove815-675
Spring Valley815-663, 815-664
Sterling815-622, 815-625, 815-626
Stockton815-947
Streator815-672, 815-673
Sycamore815-895, 815-899
Union815-923
Walnut815-379
Warren815-745
Watseka815-432
Wilmington815-476
Winnebago815-335
Wonder Lake815-653, 815-728
Woodstock815-206, 815-334, 815-337, 815-338
All area codes in Illinois

Local time in Illinois

TimezoneGMTTime
America/Chicago-05:00
[loading...]

Map of Illinois

Other area codes in United States

Area Codes Search Notes

Fixed phone numbers in the United States, state Illinois (area code 815) are comprised of a single country code (+1), a 3 digit area code, a 3 digit local office code (or region code), and a 4 digit line code. Making a call with the wrong country, area, or region code can be costly. Browse our sites area and region codes by state and city to ensure you have the correct information for your calls. Each states page contains a list of the cities within that state and the numbers of that area. Also available are local times. So you don’t have to worry about calling too late or early again.

Getting calls from someone and want to know what state they are in? Try our reverse phone number lookup to find their location, it even works with mobile, toll free and other numbers. Just enter the number into the search field for instant results.