| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 421-10** | (301) 421-1001 - (301) 421-1099 | 69 |
| (301) 421-11** | (301) 421-1100 - (301) 421-1199 | 79 |
| (301) 421-12** | (301) 421-1200 - (301) 421-1297 | 67 |
| (301) 421-13** | (301) 421-1300 - (301) 421-1399 | 75 |
| (301) 421-14** | (301) 421-1400 - (301) 421-1498 | 69 |
| (301) 421-15** | (301) 421-1500 - (301) 421-1599 | 72 |
| (301) 421-16** | (301) 421-1600 - (301) 421-1698 | 75 |
| (301) 421-17** | (301) 421-1700 - (301) 421-1799 | 63 |
| (301) 421-18** | (301) 421-1800 - (301) 421-1899 | 75 |
| (301) 421-19** | (301) 421-1900 - (301) 421-1998 | 67 |
US Phone Directory: (301) 421-1***
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