| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (240) 631-10** | (240) 631-1000 - (240) 631-1097 | 50 |
| (240) 631-11** | (240) 631-1100 - (240) 631-1199 | 62 |
| (240) 631-12** | (240) 631-1200 - (240) 631-1299 | 51 |
| (240) 631-13** | (240) 631-1301 - (240) 631-1398 | 45 |
| (240) 631-14** | (240) 631-1401 - (240) 631-1499 | 54 |
| (240) 631-15** | (240) 631-1501 - (240) 631-1599 | 54 |
| (240) 631-16** | (240) 631-1602 - (240) 631-1699 | 72 |
| (240) 631-17** | (240) 631-1702 - (240) 631-1799 | 49 |
| (240) 631-18** | (240) 631-1800 - (240) 631-1800 | 1 |
| (240) 631-19** | (240) 631-1902 - (240) 631-1999 | 52 |
US Phone Directory: (240) 631-1***
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