| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 840-10** | (301) 840-1000 - (301) 840-1099 | 55 |
| (301) 840-11** | (301) 840-1100 - (301) 840-1199 | 48 |
| (301) 840-12** | (301) 840-1200 - (301) 840-1299 | 59 |
| (301) 840-13** | (301) 840-1303 - (301) 840-1399 | 44 |
| (301) 840-14** | (301) 840-1400 - (301) 840-1499 | 52 |
| (301) 840-15** | (301) 840-1500 - (301) 840-1598 | 49 |
| (301) 840-16** | (301) 840-1601 - (301) 840-1697 | 40 |
| (301) 840-17** | (301) 840-1700 - (301) 840-1798 | 49 |
| (301) 840-18** | (301) 840-1800 - (301) 840-1899 | 54 |
| (301) 840-19** | (301) 840-1900 - (301) 840-1998 | 49 |
US Phone Directory: (301) 840-1***
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