| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 928-60** | (301) 928-6000 - (301) 928-6099 | 26 |
| (301) 928-61** | (301) 928-6103 - (301) 928-6198 | 38 |
| (301) 928-62** | (301) 928-6203 - (301) 928-6298 | 36 |
| (301) 928-63** | (301) 928-6305 - (301) 928-6399 | 30 |
| (301) 928-64** | (301) 928-6403 - (301) 928-6493 | 30 |
| (301) 928-65** | (301) 928-6505 - (301) 928-6598 | 29 |
| (301) 928-66** | (301) 928-6601 - (301) 928-6699 | 22 |
| (301) 928-67** | (301) 928-6700 - (301) 928-6793 | 25 |
| (301) 928-68** | (301) 928-6800 - (301) 928-6897 | 26 |
| (301) 928-69** | (301) 928-6902 - (301) 928-6991 | 30 |
US Phone Directory: (301) 928-6***
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