| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (847) 431-20** | (847) 431-2001 - (847) 431-2088 | 19 |
| (847) 431-21** | (847) 431-2100 - (847) 431-2192 | 21 |
| (847) 431-22** | (847) 431-2200 - (847) 431-2299 | 21 |
| (847) 431-23** | (847) 431-2301 - (847) 431-2390 | 21 |
| (847) 431-24** | (847) 431-2400 - (847) 431-2499 | 25 |
| (847) 431-25** | (847) 431-2500 - (847) 431-2596 | 13 |
| (847) 431-26** | (847) 431-2600 - (847) 431-2699 | 21 |
| (847) 431-27** | (847) 431-2705 - (847) 431-2799 | 18 |
| (847) 431-28** | (847) 431-2809 - (847) 431-2895 | 19 |
| (847) 431-29** | (847) 431-2910 - (847) 431-2961 | 10 |
US Phone Directory: (847) 431-2***
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