| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 399-60** | (301) 399-6004 - (301) 399-6086 | 10 |
| (301) 399-61** | (301) 399-6100 - (301) 399-6192 | 11 |
| (301) 399-62** | (301) 399-6204 - (301) 399-6287 | 6 |
| (301) 399-63** | (301) 399-6305 - (301) 399-6378 | 7 |
| (301) 399-64** | (301) 399-6404 - (301) 399-6488 | 10 |
| (301) 399-65** | (301) 399-6502 - (301) 399-6588 | 7 |
| (301) 399-66** | (301) 399-6604 - (301) 399-6690 | 14 |
| (301) 399-67** | (301) 399-6719 - (301) 399-6762 | 8 |
| (301) 399-68** | (301) 399-6811 - (301) 399-6893 | 9 |
| (301) 399-69** | (301) 399-6909 - (301) 399-6996 | 8 |
US Phone Directory: (301) 399-6***
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