| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (303) 520-00** | (303) 520-0000 - (303) 520-0099 | 44 |
| (303) 520-01** | (303) 520-0101 - (303) 520-0195 | 43 |
| (303) 520-02** | (303) 520-0200 - (303) 520-0299 | 42 |
| (303) 520-03** | (303) 520-0303 - (303) 520-0399 | 33 |
| (303) 520-04** | (303) 520-0404 - (303) 520-0497 | 36 |
| (303) 520-05** | (303) 520-0500 - (303) 520-0599 | 38 |
| (303) 520-06** | (303) 520-0600 - (303) 520-0696 | 29 |
| (303) 520-07** | (303) 520-0701 - (303) 520-0799 | 42 |
| (303) 520-08** | (303) 520-0804 - (303) 520-0898 | 39 |
| (303) 520-09** | (303) 520-0901 - (303) 520-0999 | 38 |
US Phone Directory: (303) 520-0***
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