| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (303) 421-30** | (303) 421-3000 - (303) 421-3098 | 68 |
| (303) 421-31** | (303) 421-3100 - (303) 421-3199 | 69 |
| (303) 421-32** | (303) 421-3201 - (303) 421-3298 | 70 |
| (303) 421-33** | (303) 421-3302 - (303) 421-3399 | 76 |
| (303) 421-34** | (303) 421-3401 - (303) 421-3499 | 63 |
| (303) 421-35** | (303) 421-3500 - (303) 421-3598 | 63 |
| (303) 421-36** | (303) 421-3600 - (303) 421-3699 | 74 |
| (303) 421-37** | (303) 421-3700 - (303) 421-3799 | 71 |
| (303) 421-38** | (303) 421-3800 - (303) 421-3898 | 70 |
| (303) 421-39** | (303) 421-3900 - (303) 421-3999 | 77 |
US Phone Directory: (303) 421-3***
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