| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 218-30** | (301) 218-3000 - (301) 218-3083 | 5 |
| (301) 218-31** | (301) 218-3100 - (301) 218-3198 | 29 |
| (301) 218-32** | (301) 218-3221 - (301) 218-3227 | 3 |
| (301) 218-33** | (301) 218-3301 - (301) 218-3399 | 52 |
| (301) 218-34** | (301) 218-3400 - (301) 218-3499 | 47 |
| (301) 218-35** | (301) 218-3500 - (301) 218-3597 | 45 |
| (301) 218-36** | (301) 218-3601 - (301) 218-3695 | 52 |
| (301) 218-37** | (301) 218-3700 - (301) 218-3798 | 40 |
| (301) 218-38** | (301) 218-3800 - (301) 218-3899 | 46 |
| (301) 218-39** | (301) 218-3904 - (301) 218-3999 | 50 |
US Phone Directory: (301) 218-3***
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