| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 330-00** | (301) 330-0000 - (301) 330-0099 | 85 |
| (301) 330-01** | (301) 330-0101 - (301) 330-0197 | 74 |
| (301) 330-02** | (301) 330-0200 - (301) 330-0299 | 81 |
| (301) 330-03** | (301) 330-0300 - (301) 330-0399 | 87 |
| (301) 330-04** | (301) 330-0400 - (301) 330-0499 | 80 |
| (301) 330-05** | (301) 330-0501 - (301) 330-0599 | 80 |
| (301) 330-06** | (301) 330-0600 - (301) 330-0699 | 87 |
| (301) 330-07** | (301) 330-0700 - (301) 330-0799 | 83 |
| (301) 330-08** | (301) 330-0802 - (301) 330-0899 | 80 |
| (301) 330-09** | (301) 330-0900 - (301) 330-0999 | 82 |
US Phone Directory: (301) 330-0***
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