| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (240) 280-10** | (240) 280-1004 - (240) 280-1099 | 75 |
| (240) 280-11** | (240) 280-1101 - (240) 280-1199 | 80 |
| (240) 280-12** | (240) 280-1200 - (240) 280-1299 | 76 |
| (240) 280-13** | (240) 280-1300 - (240) 280-1399 | 85 |
| (240) 280-14** | (240) 280-1400 - (240) 280-1499 | 91 |
| (240) 280-15** | (240) 280-1500 - (240) 280-1599 | 75 |
| (240) 280-16** | (240) 280-1600 - (240) 280-1698 | 77 |
| (240) 280-17** | (240) 280-1700 - (240) 280-1798 | 76 |
| (240) 280-18** | (240) 280-1800 - (240) 280-1899 | 78 |
| (240) 280-19** | (240) 280-1900 - (240) 280-1976 | 46 |
US Phone Directory: (240) 280-1***
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