| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (773) 866-10** | (773) 866-1000 - (773) 866-1089 | 60 |
| (773) 866-11** | (773) 866-1100 - (773) 866-1198 | 58 |
| (773) 866-12** | (773) 866-1200 - (773) 866-1299 | 63 |
| (773) 866-13** | (773) 866-1300 - (773) 866-1399 | 78 |
| (773) 866-14** | (773) 866-1400 - (773) 866-1499 | 65 |
| (773) 866-15** | (773) 866-1500 - (773) 866-1599 | 78 |
| (773) 866-16** | (773) 866-1600 - (773) 866-1698 | 78 |
| (773) 866-17** | (773) 866-1700 - (773) 866-1799 | 77 |
| (773) 866-18** | (773) 866-1800 - (773) 866-1898 | 67 |
| (773) 866-19** | (773) 866-1900 - (773) 866-1999 | 89 |
US Phone Directory: (773) 866-1***
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