| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (303) 421-10** | (303) 421-1002 - (303) 421-1099 | 78 |
| (303) 421-11** | (303) 421-1100 - (303) 421-1199 | 80 |
| (303) 421-12** | (303) 421-1200 - (303) 421-1299 | 77 |
| (303) 421-13** | (303) 421-1300 - (303) 421-1399 | 79 |
| (303) 421-14** | (303) 421-1400 - (303) 421-1498 | 77 |
| (303) 421-15** | (303) 421-1500 - (303) 421-1599 | 76 |
| (303) 421-16** | (303) 421-1600 - (303) 421-1699 | 78 |
| (303) 421-17** | (303) 421-1700 - (303) 421-1799 | 81 |
| (303) 421-18** | (303) 421-1800 - (303) 421-1899 | 80 |
| (303) 421-19** | (303) 421-1900 - (303) 421-1999 | 75 |
US Phone Directory: (303) 421-1***
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