| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 322-10** | (301) 322-1000 - (301) 322-1098 | 71 |
| (301) 322-11** | (301) 322-1100 - (301) 322-1199 | 65 |
| (301) 322-12** | (301) 322-1200 - (301) 322-1299 | 75 |
| (301) 322-13** | (301) 322-1301 - (301) 322-1399 | 72 |
| (301) 322-14** | (301) 322-1400 - (301) 322-1499 | 75 |
| (301) 322-15** | (301) 322-1501 - (301) 322-1599 | 69 |
| (301) 322-16** | (301) 322-1602 - (301) 322-1699 | 77 |
| (301) 322-17** | (301) 322-1700 - (301) 322-1798 | 78 |
| (301) 322-18** | (301) 322-1800 - (301) 322-1899 | 67 |
| (301) 322-19** | (301) 322-1900 - (301) 322-1999 | 76 |
US Phone Directory: (301) 322-1***
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