| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 421-20** | (312) 421-2000 - (312) 421-2099 | 50 |
| (312) 421-21** | (312) 421-2100 - (312) 421-2194 | 47 |
| (312) 421-22** | (312) 421-2201 - (312) 421-2298 | 62 |
| (312) 421-23** | (312) 421-2300 - (312) 421-2399 | 53 |
| (312) 421-24** | (312) 421-2400 - (312) 421-2493 | 50 |
| (312) 421-25** | (312) 421-2500 - (312) 421-2599 | 62 |
| (312) 421-26** | (312) 421-2600 - (312) 421-2699 | 42 |
| (312) 421-27** | (312) 421-2701 - (312) 421-2799 | 45 |
| (312) 421-28** | (312) 421-2800 - (312) 421-2899 | 42 |
| (312) 421-29** | (312) 421-2900 - (312) 421-2999 | 60 |
US Phone Directory: (312) 421-2***
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