| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 899-20** | (301) 899-2000 - (301) 899-2089 | 64 |
| (301) 899-21** | (301) 899-2100 - (301) 899-2199 | 70 |
| (301) 899-22** | (301) 899-2202 - (301) 899-2297 | 69 |
| (301) 899-23** | (301) 899-2300 - (301) 899-2399 | 80 |
| (301) 899-24** | (301) 899-2400 - (301) 899-2499 | 66 |
| (301) 899-25** | (301) 899-2500 - (301) 899-2598 | 69 |
| (301) 899-26** | (301) 899-2600 - (301) 899-2698 | 70 |
| (301) 899-27** | (301) 899-2700 - (301) 899-2799 | 74 |
| (301) 899-28** | (301) 899-2800 - (301) 899-2899 | 72 |
| (301) 899-29** | (301) 899-2900 - (301) 899-2999 | 71 |
US Phone Directory: (301) 899-2***
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