| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 428-00** | (301) 428-0000 - (301) 428-0099 | 63 |
| (301) 428-01** | (301) 428-0100 - (301) 428-0199 | 62 |
| (301) 428-02** | (301) 428-0200 - (301) 428-0298 | 53 |
| (301) 428-03** | (301) 428-0301 - (301) 428-0399 | 53 |
| (301) 428-04** | (301) 428-0401 - (301) 428-0499 | 54 |
| (301) 428-05** | (301) 428-0500 - (301) 428-0599 | 58 |
| (301) 428-06** | (301) 428-0602 - (301) 428-0695 | 48 |
| (301) 428-07** | (301) 428-0701 - (301) 428-0797 | 51 |
| (301) 428-08** | (301) 428-0800 - (301) 428-0899 | 53 |
| (301) 428-09** | (301) 428-0900 - (301) 428-0999 | 58 |
US Phone Directory: (301) 428-0***
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