| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (847) 721-70** | (847) 721-7000 - (847) 721-7094 | 37 |
| (847) 721-71** | (847) 721-7100 - (847) 721-7194 | 33 |
| (847) 721-72** | (847) 721-7201 - (847) 721-7299 | 30 |
| (847) 721-73** | (847) 721-7300 - (847) 721-7396 | 27 |
| (847) 721-74** | (847) 721-7402 - (847) 721-7496 | 26 |
| (847) 721-75** | (847) 721-7510 - (847) 721-7598 | 29 |
| (847) 721-76** | (847) 721-7600 - (847) 721-7698 | 29 |
| (847) 721-77** | (847) 721-7700 - (847) 721-7797 | 25 |
| (847) 721-78** | (847) 721-7800 - (847) 721-7898 | 28 |
| (847) 721-79** | (847) 721-7900 - (847) 721-7997 | 31 |
US Phone Directory: (847) 721-7***
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