| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 299-30** | (301) 299-3000 - (301) 299-3099 | 75 |
| (301) 299-31** | (301) 299-3100 - (301) 299-3199 | 80 |
| (301) 299-32** | (301) 299-3201 - (301) 299-3299 | 72 |
| (301) 299-33** | (301) 299-3300 - (301) 299-3398 | 76 |
| (301) 299-34** | (301) 299-3400 - (301) 299-3499 | 85 |
| (301) 299-35** | (301) 299-3500 - (301) 299-3599 | 77 |
| (301) 299-36** | (301) 299-3601 - (301) 299-3699 | 77 |
| (301) 299-37** | (301) 299-3700 - (301) 299-3799 | 78 |
| (301) 299-38** | (301) 299-3804 - (301) 299-3898 | 72 |
| (301) 299-39** | (301) 299-3900 - (301) 299-3999 | 79 |
US Phone Directory: (301) 299-3***
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