| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (303) 306-10** | (303) 306-1000 - (303) 306-1099 | 74 |
| (303) 306-11** | (303) 306-1100 - (303) 306-1199 | 73 |
| (303) 306-12** | (303) 306-1200 - (303) 306-1299 | 73 |
| (303) 306-13** | (303) 306-1300 - (303) 306-1399 | 76 |
| (303) 306-14** | (303) 306-1400 - (303) 306-1499 | 78 |
| (303) 306-15** | (303) 306-1500 - (303) 306-1599 | 79 |
| (303) 306-16** | (303) 306-1600 - (303) 306-1699 | 81 |
| (303) 306-17** | (303) 306-1700 - (303) 306-1799 | 68 |
| (303) 306-18** | (303) 306-1800 - (303) 306-1899 | 68 |
| (303) 306-19** | (303) 306-1900 - (303) 306-1999 | 77 |
US Phone Directory: (303) 306-1***
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