| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 237-30** | (301) 237-3000 - (301) 237-3097 | 6 |
| (301) 237-31** | (301) 237-3101 - (301) 237-3198 | 8 |
| (301) 237-32** | (301) 237-3238 - (301) 237-3291 | 6 |
| (301) 237-33** | (301) 237-3326 - (301) 237-3385 | 8 |
| (301) 237-34** | (301) 237-3431 - (301) 237-3486 | 4 |
| (301) 237-35** | (301) 237-3505 - (301) 237-3598 | 7 |
| (301) 237-36** | (301) 237-3601 - (301) 237-3685 | 7 |
| (301) 237-37** | (301) 237-3704 - (301) 237-3795 | 11 |
| (301) 237-38** | (301) 237-3809 - (301) 237-3894 | 11 |
| (301) 237-39** | (301) 237-3921 - (301) 237-3941 | 3 |
US Phone Directory: (301) 237-3***
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