| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 274-30** | (301) 274-3001 - (301) 274-3099 | 77 |
| (301) 274-31** | (301) 274-3101 - (301) 274-3199 | 68 |
| (301) 274-32** | (301) 274-3200 - (301) 274-3298 | 83 |
| (301) 274-33** | (301) 274-3301 - (301) 274-3399 | 81 |
| (301) 274-34** | (301) 274-3401 - (301) 274-3499 | 72 |
| (301) 274-35** | (301) 274-3501 - (301) 274-3599 | 79 |
| (301) 274-36** | (301) 274-3606 - (301) 274-3698 | 70 |
| (301) 274-37** | (301) 274-3701 - (301) 274-3798 | 74 |
| (301) 274-38** | (301) 274-3800 - (301) 274-3899 | 77 |
| (301) 274-39** | (301) 274-3902 - (301) 274-3999 | 78 |
US Phone Directory: (301) 274-3***
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