| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 231-80** | (301) 231-8000 - (301) 231-8098 | 53 |
| (301) 231-81** | (301) 231-8100 - (301) 231-8197 | 49 |
| (301) 231-82** | (301) 231-8200 - (301) 231-8299 | 43 |
| (301) 231-83** | (301) 231-8300 - (301) 231-8399 | 48 |
| (301) 231-85** | (301) 231-8500 - (301) 231-8598 | 39 |
| (301) 231-86** | (301) 231-8600 - (301) 231-8697 | 47 |
| (301) 231-87** | (301) 231-8700 - (301) 231-8798 | 58 |
| (301) 231-88** | (301) 231-8877 - (301) 231-8877 | 1 |
| (301) 231-89** | (301) 231-8900 - (301) 231-8999 | 49 |
US Phone Directory: (301) 231-8***
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