| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 299-80** | (301) 299-8002 - (301) 299-8099 | 70 |
| (301) 299-81** | (301) 299-8100 - (301) 299-8199 | 67 |
| (301) 299-82** | (301) 299-8200 - (301) 299-8299 | 66 |
| (301) 299-83** | (301) 299-8300 - (301) 299-8399 | 61 |
| (301) 299-84** | (301) 299-8400 - (301) 299-8496 | 57 |
| (301) 299-85** | (301) 299-8500 - (301) 299-8599 | 65 |
| (301) 299-86** | (301) 299-8600 - (301) 299-8699 | 48 |
| (301) 299-87** | (301) 299-8700 - (301) 299-8799 | 69 |
| (301) 299-88** | (301) 299-8800 - (301) 299-8899 | 71 |
| (301) 299-89** | (301) 299-8900 - (301) 299-8999 | 64 |
US Phone Directory: (301) 299-8***
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