| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (303) 400-10** | (303) 400-1000 - (303) 400-1099 | 64 |
| (303) 400-11** | (303) 400-1100 - (303) 400-1199 | 75 |
| (303) 400-12** | (303) 400-1200 - (303) 400-1298 | 73 |
| (303) 400-13** | (303) 400-1300 - (303) 400-1399 | 78 |
| (303) 400-14** | (303) 400-1400 - (303) 400-1498 | 64 |
| (303) 400-15** | (303) 400-1500 - (303) 400-1599 | 77 |
| (303) 400-16** | (303) 400-1600 - (303) 400-1699 | 70 |
| (303) 400-17** | (303) 400-1700 - (303) 400-1799 | 66 |
| (303) 400-18** | (303) 400-1800 - (303) 400-1899 | 79 |
| (303) 400-19** | (303) 400-1900 - (303) 400-1999 | 67 |
US Phone Directory: (303) 400-1***
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