| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 499-80** | (301) 499-8000 - (301) 499-8091 | 7 |
| (301) 499-81** | (301) 499-8130 - (301) 499-8144 | 4 |
| (301) 499-82** | (301) 499-8212 - (301) 499-8292 | 4 |
| (301) 499-83** | (301) 499-8329 - (301) 499-8329 | 1 |
| (301) 499-84** | (301) 499-8400 - (301) 499-8499 | 64 |
| (301) 499-85** | (301) 499-8500 - (301) 499-8590 | 12 |
| (301) 499-86** | (301) 499-8600 - (301) 499-8689 | 5 |
| (301) 499-87** | (301) 499-8700 - (301) 499-8799 | 57 |
| (301) 499-88** | (301) 499-8800 - (301) 499-8898 | 55 |
| (301) 499-89** | (301) 499-8900 - (301) 499-8998 | 50 |
US Phone Directory: (301) 499-8***
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