| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 231-00** | (301) 231-0000 - (301) 231-0098 | 63 |
| (301) 231-01** | (301) 231-0100 - (301) 231-0198 | 59 |
| (301) 231-03** | (301) 231-0321 - (301) 231-0364 | 2 |
| (301) 231-04** | (301) 231-0411 - (301) 231-0491 | 6 |
| (301) 231-05** | (301) 231-0500 - (301) 231-0597 | 52 |
| (301) 231-06** | (301) 231-0600 - (301) 231-0699 | 59 |
| (301) 231-07** | (301) 231-0700 - (301) 231-0799 | 62 |
| (301) 231-08** | (301) 231-0800 - (301) 231-0899 | 56 |
| (301) 231-09** | (301) 231-0925 - (301) 231-0998 | 30 |
US Phone Directory: (301) 231-0***
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