| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 497-30** | (301) 497-3000 - (301) 497-3091 | 17 |
| (301) 497-31** | (301) 497-3100 - (301) 497-3194 | 16 |
| (301) 497-32** | (301) 497-3220 - (301) 497-3299 | 16 |
| (301) 497-33** | (301) 497-3300 - (301) 497-3374 | 5 |
| (301) 497-34** | (301) 497-3403 - (301) 497-3403 | 1 |
| (301) 497-35** | (301) 497-3519 - (301) 497-3519 | 1 |
| (301) 497-36** | (301) 497-3600 - (301) 497-3699 | 18 |
| (301) 497-39** | (301) 497-3900 - (301) 497-3999 | 21 |
US Phone Directory: (301) 497-3***
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