| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 340-80** | (301) 340-8000 - (301) 340-8099 | 60 |
| (301) 340-81** | (301) 340-8100 - (301) 340-8199 | 61 |
| (301) 340-82** | (301) 340-8200 - (301) 340-8298 | 61 |
| (301) 340-83** | (301) 340-8300 - (301) 340-8399 | 70 |
| (301) 340-84** | (301) 340-8401 - (301) 340-8499 | 69 |
| (301) 340-85** | (301) 340-8500 - (301) 340-8599 | 62 |
| (301) 340-86** | (301) 340-8600 - (301) 340-8699 | 59 |
| (301) 340-87** | (301) 340-8700 - (301) 340-8799 | 58 |
| (301) 340-88** | (301) 340-8800 - (301) 340-8899 | 60 |
| (301) 340-89** | (301) 340-8900 - (301) 340-8999 | 62 |
US Phone Directory: (301) 340-8***
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