| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (303) 421-60** | (303) 421-6019 - (303) 421-6099 | 38 |
| (303) 421-61** | (303) 421-6100 - (303) 421-6199 | 75 |
| (303) 421-62** | (303) 421-6200 - (303) 421-6299 | 80 |
| (303) 421-63** | (303) 421-6300 - (303) 421-6398 | 71 |
| (303) 421-64** | (303) 421-6400 - (303) 421-6499 | 76 |
| (303) 421-65** | (303) 421-6500 - (303) 421-6599 | 72 |
| (303) 421-66** | (303) 421-6600 - (303) 421-6699 | 73 |
| (303) 421-67** | (303) 421-6700 - (303) 421-6799 | 74 |
| (303) 421-68** | (303) 421-6800 - (303) 421-6897 | 75 |
| (303) 421-69** | (303) 421-6900 - (303) 421-6999 | 65 |
US Phone Directory: (303) 421-6***
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