| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 860-10** | (301) 860-1000 - (301) 860-1099 | 58 |
| (301) 860-11** | (301) 860-1100 - (301) 860-1199 | 76 |
| (301) 860-12** | (301) 860-1200 - (301) 860-1299 | 64 |
| (301) 860-13** | (301) 860-1300 - (301) 860-1399 | 67 |
| (301) 860-14** | (301) 860-1401 - (301) 860-1499 | 58 |
| (301) 860-15** | (301) 860-1500 - (301) 860-1599 | 66 |
| (301) 860-16** | (301) 860-1601 - (301) 860-1699 | 60 |
| (301) 860-17** | (301) 860-1700 - (301) 860-1799 | 56 |
| (301) 860-18** | (301) 860-1800 - (301) 860-1899 | 57 |
| (301) 860-19** | (301) 860-1900 - (301) 860-1998 | 58 |
US Phone Directory: (301) 860-1***
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