| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (303) 388-50** | (303) 388-5000 - (303) 388-5098 | 64 |
| (303) 388-51** | (303) 388-5100 - (303) 388-5199 | 62 |
| (303) 388-52** | (303) 388-5200 - (303) 388-5299 | 66 |
| (303) 388-53** | (303) 388-5300 - (303) 388-5398 | 51 |
| (303) 388-54** | (303) 388-5400 - (303) 388-5499 | 55 |
| (303) 388-55** | (303) 388-5500 - (303) 388-5599 | 49 |
| (303) 388-56** | (303) 388-5600 - (303) 388-5699 | 51 |
| (303) 388-57** | (303) 388-5700 - (303) 388-5799 | 45 |
| (303) 388-58** | (303) 388-5800 - (303) 388-5899 | 49 |
| (303) 388-59** | (303) 388-5900 - (303) 388-5998 | 53 |
US Phone Directory: (303) 388-5***
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