| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (773) 521-20** | (773) 521-2000 - (773) 521-2099 | 47 |
| (773) 521-21** | (773) 521-2100 - (773) 521-2198 | 31 |
| (773) 521-22** | (773) 521-2200 - (773) 521-2297 | 25 |
| (773) 521-23** | (773) 521-2300 - (773) 521-2399 | 49 |
| (773) 521-24** | (773) 521-2400 - (773) 521-2496 | 37 |
| (773) 521-25** | (773) 521-2500 - (773) 521-2599 | 28 |
| (773) 521-26** | (773) 521-2600 - (773) 521-2699 | 31 |
| (773) 521-27** | (773) 521-2700 - (773) 521-2798 | 36 |
| (773) 521-28** | (773) 521-2800 - (773) 521-2898 | 51 |
| (773) 521-29** | (773) 521-2902 - (773) 521-2999 | 35 |
US Phone Directory: (773) 521-2***
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