| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (303) 777-10** | (303) 777-1000 - (303) 777-1095 | 65 |
| (303) 777-11** | (303) 777-1100 - (303) 777-1199 | 69 |
| (303) 777-12** | (303) 777-1200 - (303) 777-1299 | 73 |
| (303) 777-13** | (303) 777-1300 - (303) 777-1399 | 66 |
| (303) 777-14** | (303) 777-1400 - (303) 777-1499 | 67 |
| (303) 777-15** | (303) 777-1500 - (303) 777-1599 | 64 |
| (303) 777-16** | (303) 777-1600 - (303) 777-1699 | 67 |
| (303) 777-17** | (303) 777-1700 - (303) 777-1797 | 67 |
| (303) 777-18** | (303) 777-1800 - (303) 777-1899 | 67 |
| (303) 777-19** | (303) 777-1900 - (303) 777-1999 | 75 |
US Phone Directory: (303) 777-1***
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