| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (240) 421-10** | (240) 421-1020 - (240) 421-1099 | 5 |
| (240) 421-11** | (240) 421-1115 - (240) 421-1191 | 2 |
| (240) 421-12** | (240) 421-1260 - (240) 421-1295 | 2 |
| (240) 421-13** | (240) 421-1315 - (240) 421-1396 | 5 |
| (240) 421-14** | (240) 421-1435 - (240) 421-1479 | 4 |
| (240) 421-15** | (240) 421-1511 - (240) 421-1589 | 5 |
| (240) 421-16** | (240) 421-1604 - (240) 421-1668 | 7 |
| (240) 421-17** | (240) 421-1750 - (240) 421-1788 | 5 |
| (240) 421-18** | (240) 421-1800 - (240) 421-1863 | 3 |
| (240) 421-19** | (240) 421-1939 - (240) 421-1988 | 5 |
US Phone Directory: (240) 421-1***
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