| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (303) 997-50** | (303) 997-5000 - (303) 997-5099 | 93 |
| (303) 997-51** | (303) 997-5100 - (303) 997-5199 | 94 |
| (303) 997-52** | (303) 997-5201 - (303) 997-5299 | 88 |
| (303) 997-53** | (303) 997-5300 - (303) 997-5399 | 91 |
| (303) 997-54** | (303) 997-5400 - (303) 997-5499 | 93 |
| (303) 997-55** | (303) 997-5501 - (303) 997-5599 | 88 |
| (303) 997-56** | (303) 997-5600 - (303) 997-5699 | 95 |
| (303) 997-57** | (303) 997-5700 - (303) 997-5799 | 95 |
| (303) 997-58** | (303) 997-5800 - (303) 997-5899 | 86 |
| (303) 997-59** | (303) 997-5900 - (303) 997-5999 | 83 |
US Phone Directory: (303) 997-5***
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