| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (303) 550-40** | (303) 550-4000 - (303) 550-4097 | 50 |
| (303) 550-41** | (303) 550-4101 - (303) 550-4188 | 37 |
| (303) 550-42** | (303) 550-4200 - (303) 550-4298 | 37 |
| (303) 550-43** | (303) 550-4306 - (303) 550-4391 | 32 |
| (303) 550-44** | (303) 550-4400 - (303) 550-4499 | 37 |
| (303) 550-45** | (303) 550-4500 - (303) 550-4598 | 51 |
| (303) 550-46** | (303) 550-4611 - (303) 550-4699 | 36 |
| (303) 550-47** | (303) 550-4701 - (303) 550-4793 | 42 |
| (303) 550-48** | (303) 550-4803 - (303) 550-4898 | 35 |
| (303) 550-49** | (303) 550-4900 - (303) 550-4999 | 37 |
US Phone Directory: (303) 550-4***
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