| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 812-00** | (301) 812-0000 - (301) 812-0099 | 71 |
| (301) 812-01** | (301) 812-0102 - (301) 812-0192 | 47 |
| (301) 812-02** | (301) 812-0200 - (301) 812-0299 | 65 |
| (301) 812-03** | (301) 812-0300 - (301) 812-0399 | 35 |
| (301) 812-04** | (301) 812-0403 - (301) 812-0499 | 64 |
| (301) 812-05** | (301) 812-0501 - (301) 812-0599 | 18 |
| (301) 812-06** | (301) 812-0600 - (301) 812-0699 | 56 |
| (301) 812-07** | (301) 812-0700 - (301) 812-0799 | 52 |
| (301) 812-08** | (301) 812-0800 - (301) 812-0899 | 61 |
| (301) 812-09** | (301) 812-0901 - (301) 812-0999 | 63 |
US Phone Directory: (301) 812-0***
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