| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 856-10** | (301) 856-1000 - (301) 856-1098 | 66 |
| (301) 856-11** | (301) 856-1100 - (301) 856-1197 | 60 |
| (301) 856-12** | (301) 856-1200 - (301) 856-1297 | 62 |
| (301) 856-13** | (301) 856-1307 - (301) 856-1399 | 57 |
| (301) 856-14** | (301) 856-1400 - (301) 856-1499 | 70 |
| (301) 856-15** | (301) 856-1506 - (301) 856-1599 | 56 |
| (301) 856-16** | (301) 856-1600 - (301) 856-1697 | 47 |
| (301) 856-17** | (301) 856-1700 - (301) 856-1799 | 57 |
| (301) 856-18** | (301) 856-1800 - (301) 856-1898 | 53 |
| (301) 856-19** | (301) 856-1900 - (301) 856-1999 | 63 |
US Phone Directory: (301) 856-1***
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