| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 274-10** | (312) 274-1000 - (312) 274-1099 | 63 |
| (312) 274-11** | (312) 274-1100 - (312) 274-1198 | 60 |
| (312) 274-12** | (312) 274-1200 - (312) 274-1299 | 64 |
| (312) 274-13** | (312) 274-1302 - (312) 274-1399 | 69 |
| (312) 274-14** | (312) 274-1400 - (312) 274-1499 | 62 |
| (312) 274-15** | (312) 274-1500 - (312) 274-1599 | 61 |
| (312) 274-16** | (312) 274-1600 - (312) 274-1699 | 73 |
| (312) 274-17** | (312) 274-1700 - (312) 274-1799 | 57 |
| (312) 274-18** | (312) 274-1800 - (312) 274-1899 | 63 |
| (312) 274-19** | (312) 274-1900 - (312) 274-1997 | 58 |
US Phone Directory: (312) 274-1***
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