| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 515-20** | (301) 515-2000 - (301) 515-2000 | 1 |
| (301) 515-21** | (301) 515-2100 - (301) 515-2194 | 2 |
| (301) 515-22** | (301) 515-2213 - (301) 515-2279 | 2 |
| (301) 515-23** | (301) 515-2300 - (301) 515-2399 | 83 |
| (301) 515-24** | (301) 515-2401 - (301) 515-2499 | 84 |
| (301) 515-25** | (301) 515-2501 - (301) 515-2599 | 90 |
| (301) 515-26** | (301) 515-2601 - (301) 515-2699 | 86 |
| (301) 515-27** | (301) 515-2700 - (301) 515-2799 | 75 |
| (301) 515-28** | (301) 515-2800 - (301) 515-2899 | 83 |
| (301) 515-29** | (301) 515-2900 - (301) 515-2998 | 74 |
US Phone Directory: (301) 515-2***
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