| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 434-80** | (301) 434-8000 - (301) 434-8099 | 71 |
| (301) 434-81** | (301) 434-8101 - (301) 434-8197 | 62 |
| (301) 434-82** | (301) 434-8200 - (301) 434-8299 | 63 |
| (301) 434-83** | (301) 434-8300 - (301) 434-8399 | 74 |
| (301) 434-84** | (301) 434-8400 - (301) 434-8498 | 67 |
| (301) 434-85** | (301) 434-8500 - (301) 434-8599 | 61 |
| (301) 434-86** | (301) 434-8600 - (301) 434-8699 | 74 |
| (301) 434-87** | (301) 434-8704 - (301) 434-8799 | 69 |
| (301) 434-88** | (301) 434-8800 - (301) 434-8898 | 76 |
| (301) 434-89** | (301) 434-8900 - (301) 434-8999 | 55 |
US Phone Directory: (301) 434-8***
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