| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 643-20** | (312) 643-2000 - (312) 643-2099 | 97 |
| (312) 643-21** | (312) 643-2100 - (312) 643-2199 | 88 |
| (312) 643-22** | (312) 643-2200 - (312) 643-2299 | 95 |
| (312) 643-23** | (312) 643-2300 - (312) 643-2399 | 92 |
| (312) 643-24** | (312) 643-2401 - (312) 643-2499 | 92 |
| (312) 643-25** | (312) 643-2500 - (312) 643-2599 | 86 |
| (312) 643-26** | (312) 643-2600 - (312) 643-2699 | 85 |
| (312) 643-27** | (312) 643-2701 - (312) 643-2799 | 84 |
| (312) 643-28** | (312) 643-2800 - (312) 643-2899 | 74 |
| (312) 643-29** | (312) 643-2900 - (312) 643-2999 | 66 |
US Phone Directory: (312) 643-2***
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