| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 666-20** | (312) 666-2000 - (312) 666-2099 | 48 |
| (312) 666-21** | (312) 666-2100 - (312) 666-2199 | 43 |
| (312) 666-22** | (312) 666-2200 - (312) 666-2299 | 62 |
| (312) 666-23** | (312) 666-2305 - (312) 666-2399 | 52 |
| (312) 666-24** | (312) 666-2401 - (312) 666-2499 | 46 |
| (312) 666-25** | (312) 666-2500 - (312) 666-2598 | 42 |
| (312) 666-26** | (312) 666-2600 - (312) 666-2699 | 54 |
| (312) 666-27** | (312) 666-2700 - (312) 666-2799 | 55 |
| (312) 666-28** | (312) 666-2800 - (312) 666-2891 | 45 |
| (312) 666-29** | (312) 666-2900 - (312) 666-2999 | 47 |
US Phone Directory: (312) 666-2***
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