| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (303) 423-50** | (303) 423-5000 - (303) 423-5099 | 65 |
| (303) 423-51** | (303) 423-5101 - (303) 423-5199 | 67 |
| (303) 423-52** | (303) 423-5201 - (303) 423-5299 | 74 |
| (303) 423-53** | (303) 423-5300 - (303) 423-5397 | 66 |
| (303) 423-54** | (303) 423-5400 - (303) 423-5499 | 71 |
| (303) 423-55** | (303) 423-5500 - (303) 423-5596 | 69 |
| (303) 423-56** | (303) 423-5600 - (303) 423-5699 | 65 |
| (303) 423-57** | (303) 423-5701 - (303) 423-5799 | 66 |
| (303) 423-58** | (303) 423-5800 - (303) 423-5899 | 68 |
| (303) 423-59** | (303) 423-5900 - (303) 423-5998 | 73 |
US Phone Directory: (303) 423-5***
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