| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (303) 974-50** | (303) 974-5000 - (303) 974-5099 | 90 |
| (303) 974-51** | (303) 974-5100 - (303) 974-5199 | 87 |
| (303) 974-52** | (303) 974-5200 - (303) 974-5299 | 91 |
| (303) 974-53** | (303) 974-5300 - (303) 974-5399 | 87 |
| (303) 974-54** | (303) 974-5400 - (303) 974-5499 | 88 |
| (303) 974-55** | (303) 974-5500 - (303) 974-5599 | 92 |
| (303) 974-56** | (303) 974-5600 - (303) 974-5699 | 89 |
| (303) 974-57** | (303) 974-5700 - (303) 974-5799 | 88 |
| (303) 974-58** | (303) 974-5800 - (303) 974-5899 | 88 |
| (303) 974-59** | (303) 974-5900 - (303) 974-5999 | 78 |
US Phone Directory: (303) 974-5***
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