| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (303) 721-00** | (303) 721-0004 - (303) 721-0099 | 35 |
| (303) 721-01** | (303) 721-0100 - (303) 721-0196 | 40 |
| (303) 721-02** | (303) 721-0200 - (303) 721-0299 | 36 |
| (303) 721-03** | (303) 721-0300 - (303) 721-0388 | 43 |
| (303) 721-04** | (303) 721-0400 - (303) 721-0491 | 42 |
| (303) 721-05** | (303) 721-0500 - (303) 721-0599 | 38 |
| (303) 721-06** | (303) 721-0605 - (303) 721-0698 | 32 |
| (303) 721-07** | (303) 721-0700 - (303) 721-0797 | 36 |
| (303) 721-08** | (303) 721-0800 - (303) 721-0899 | 39 |
| (303) 721-09** | (303) 721-0900 - (303) 721-0995 | 36 |
US Phone Directory: (303) 721-0***
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