| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (773) 721-10** | (773) 721-1000 - (773) 721-1099 | 73 |
| (773) 721-11** | (773) 721-1100 - (773) 721-1199 | 56 |
| (773) 721-12** | (773) 721-1200 - (773) 721-1299 | 70 |
| (773) 721-13** | (773) 721-1300 - (773) 721-1399 | 58 |
| (773) 721-14** | (773) 721-1402 - (773) 721-1499 | 68 |
| (773) 721-15** | (773) 721-1500 - (773) 721-1599 | 62 |
| (773) 721-16** | (773) 721-1600 - (773) 721-1699 | 56 |
| (773) 721-17** | (773) 721-1701 - (773) 721-1799 | 48 |
| (773) 721-18** | (773) 721-1801 - (773) 721-1899 | 71 |
| (773) 721-19** | (773) 721-1900 - (773) 721-1999 | 68 |
US Phone Directory: (773) 721-1***
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