| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 515-30** | (301) 515-3000 - (301) 515-3099 | 78 |
| (301) 515-31** | (301) 515-3101 - (301) 515-3199 | 81 |
| (301) 515-32** | (301) 515-3200 - (301) 515-3299 | 71 |
| (301) 515-33** | (301) 515-3300 - (301) 515-3399 | 79 |
| (301) 515-34** | (301) 515-3401 - (301) 515-3487 | 18 |
| (301) 515-35** | (301) 515-3578 - (301) 515-3578 | 1 |
| (301) 515-36** | (301) 515-3622 - (301) 515-3699 | 30 |
| (301) 515-38** | (301) 515-3801 - (301) 515-3876 | 42 |
| (301) 515-39** | (301) 515-3900 - (301) 515-3999 | 79 |
US Phone Directory: (301) 515-3***
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