| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 528-80** | (301) 528-8000 - (301) 528-8096 | 68 |
| (301) 528-81** | (301) 528-8100 - (301) 528-8199 | 76 |
| (301) 528-82** | (301) 528-8200 - (301) 528-8298 | 80 |
| (301) 528-83** | (301) 528-8301 - (301) 528-8399 | 79 |
| (301) 528-84** | (301) 528-8401 - (301) 528-8498 | 77 |
| (301) 528-85** | (301) 528-8501 - (301) 528-8598 | 78 |
| (301) 528-86** | (301) 528-8603 - (301) 528-8699 | 80 |
| (301) 528-87** | (301) 528-8700 - (301) 528-8799 | 83 |
| (301) 528-88** | (301) 528-8801 - (301) 528-8898 | 84 |
| (301) 528-89** | (301) 528-8900 - (301) 528-8999 | 74 |
US Phone Directory: (301) 528-8***
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