| General Information for Area Code 815 | |
|---|---|
| Country | United States |
| State/Province | Illinois |
| Major City | Chicago |
| Time Zone | Central |
| Prefix | Primary City | County | Phone Type |
|---|---|---|---|
| 815-261 | Crystal Lake, IL | Mchenry | Landline |
| 815-262 | Rockford, IL | Winnebago | Cell Number |
| 815-263 | Kankakee, IL | Kankakee | Cell Number |
| 815-264 | Waterman, IL | Dekalb | Landline |
| 815-265 | Gilman, IL | Iroquois | Landline |
| 815-266 | Freeport, IL | Stephenson | Landline |
| 815-267 | Plainfield, IL | Will | Landline |
| 815-268 | Onarga, IL | Iroquois | Landline |
| 815-269 | Danforth, IL | Iroquois | Landline |
| 815-270 | Lanark, IL | Carroll | Landline |
| 815-271 | Mchenry, IL | Mchenry | Landline |
| 815-272 | Joliet, IL | Will | Landline |
| 815-273 | Savanna, IL | Carroll | Landline |
| 815-274 | Joliet, IL | Will | Cell Number |
| 815-275 | Freeport, IL | Stephenson | Cell Number |
| 815-276 | Crystal Lake, IL | Mchenry | Landline |
| 815-277 | Frankfort, IL | Will | Landline |
| 815-278 | Kankakee, IL | Kankakee | Cell Number |
| 815-279 | Kankakee, IL | Kankakee | Cell Number |
| 815-280 | Joliet, IL | Will | Landline |
| Location Details |
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Area code is a type of numbering scheme used in telecommunication. It divides the territories of its member countries, the code is a three-digit code. The digits 0 and 1 applied for central office codes. Other digits were applied into geographic areas of the service territory.
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