| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (423) 257-40** | (423) 257-4001 - (423) 257-4099 | 85 |
| (423) 257-41** | (423) 257-4100 - (423) 257-4199 | 86 |
| (423) 257-42** | (423) 257-4200 - (423) 257-4299 | 88 |
| (423) 257-43** | (423) 257-4300 - (423) 257-4399 | 81 |
| (423) 257-44** | (423) 257-4400 - (423) 257-4499 | 90 |
| (423) 257-45** | (423) 257-4501 - (423) 257-4599 | 86 |
| (423) 257-46** | (423) 257-4600 - (423) 257-4699 | 87 |
| (423) 257-47** | (423) 257-4700 - (423) 257-4799 | 81 |
| (423) 257-48** | (423) 257-4800 - (423) 257-4899 | 93 |
| (423) 257-49** | (423) 257-4900 - (423) 257-4999 | 90 |
US Phone Directory: (423) 257-4***
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