| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 528-90** | (301) 528-9001 - (301) 528-9099 | 76 |
| (301) 528-91** | (301) 528-9100 - (301) 528-9198 | 73 |
| (301) 528-92** | (301) 528-9202 - (301) 528-9299 | 77 |
| (301) 528-93** | (301) 528-9300 - (301) 528-9399 | 80 |
| (301) 528-94** | (301) 528-9401 - (301) 528-9499 | 69 |
| (301) 528-95** | (301) 528-9500 - (301) 528-9598 | 77 |
| (301) 528-96** | (301) 528-9601 - (301) 528-9699 | 72 |
| (301) 528-97** | (301) 528-9700 - (301) 528-9799 | 53 |
| (301) 528-98** | (301) 528-9800 - (301) 528-9849 | 14 |
| (301) 528-99** | (301) 528-9900 - (301) 528-9998 | 78 |
US Phone Directory: (301) 528-9***
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