| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 580-90** | (301) 580-9000 - (301) 580-9098 | 37 |
| (301) 580-91** | (301) 580-9102 - (301) 580-9199 | 27 |
| (301) 580-92** | (301) 580-9200 - (301) 580-9297 | 33 |
| (301) 580-93** | (301) 580-9300 - (301) 580-9399 | 30 |
| (301) 580-94** | (301) 580-9401 - (301) 580-9499 | 41 |
| (301) 580-95** | (301) 580-9500 - (301) 580-9588 | 26 |
| (301) 580-96** | (301) 580-9600 - (301) 580-9695 | 29 |
| (301) 580-97** | (301) 580-9702 - (301) 580-9799 | 30 |
| (301) 580-98** | (301) 580-9804 - (301) 580-9899 | 24 |
| (301) 580-99** | (301) 580-9906 - (301) 580-9994 | 30 |
US Phone Directory: (301) 580-9***
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