| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (303) 229-50** | (303) 229-5000 - (303) 229-5094 | 33 |
| (303) 229-51** | (303) 229-5101 - (303) 229-5199 | 39 |
| (303) 229-52** | (303) 229-5200 - (303) 229-5297 | 33 |
| (303) 229-53** | (303) 229-5300 - (303) 229-5399 | 28 |
| (303) 229-54** | (303) 229-5400 - (303) 229-5498 | 35 |
| (303) 229-55** | (303) 229-5500 - (303) 229-5598 | 43 |
| (303) 229-56** | (303) 229-5600 - (303) 229-5699 | 44 |
| (303) 229-57** | (303) 229-5701 - (303) 229-5798 | 36 |
| (303) 229-58** | (303) 229-5801 - (303) 229-5895 | 38 |
| (303) 229-59** | (303) 229-5910 - (303) 229-5999 | 38 |
US Phone Directory: (303) 229-5***
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