| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (303) 579-50** | (303) 579-5000 - (303) 579-5099 | 38 |
| (303) 579-51** | (303) 579-5102 - (303) 579-5196 | 40 |
| (303) 579-52** | (303) 579-5203 - (303) 579-5298 | 29 |
| (303) 579-53** | (303) 579-5300 - (303) 579-5396 | 25 |
| (303) 579-54** | (303) 579-5400 - (303) 579-5499 | 36 |
| (303) 579-55** | (303) 579-5500 - (303) 579-5595 | 36 |
| (303) 579-56** | (303) 579-5600 - (303) 579-5699 | 30 |
| (303) 579-57** | (303) 579-5700 - (303) 579-5799 | 35 |
| (303) 579-58** | (303) 579-5801 - (303) 579-5899 | 40 |
| (303) 579-59** | (303) 579-5900 - (303) 579-5998 | 39 |
US Phone Directory: (303) 579-5***
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