| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 431-00** | (301) 431-0000 - (301) 431-0098 | 64 |
| (301) 431-01** | (301) 431-0100 - (301) 431-0199 | 71 |
| (301) 431-02** | (301) 431-0201 - (301) 431-0299 | 65 |
| (301) 431-03** | (301) 431-0300 - (301) 431-0399 | 80 |
| (301) 431-04** | (301) 431-0400 - (301) 431-0499 | 81 |
| (301) 431-05** | (301) 431-0500 - (301) 431-0599 | 75 |
| (301) 431-06** | (301) 431-0601 - (301) 431-0699 | 71 |
| (301) 431-07** | (301) 431-0700 - (301) 431-0799 | 69 |
| (301) 431-08** | (301) 431-0800 - (301) 431-0899 | 79 |
| (301) 431-09** | (301) 431-0900 - (301) 431-0999 | 76 |
US Phone Directory: (301) 431-0***
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