| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 320-00** | (301) 320-0000 - (301) 320-0099 | 75 |
| (301) 320-01** | (301) 320-0100 - (301) 320-0199 | 62 |
| (301) 320-02** | (301) 320-0200 - (301) 320-0299 | 83 |
| (301) 320-03** | (301) 320-0301 - (301) 320-0399 | 75 |
| (301) 320-04** | (301) 320-0449 - (301) 320-0470 | 3 |
| (301) 320-05** | (301) 320-0500 - (301) 320-0599 | 80 |
| (301) 320-06** | (301) 320-0601 - (301) 320-0695 | 72 |
| (301) 320-07** | (301) 320-0700 - (301) 320-0797 | 80 |
| (301) 320-08** | (301) 320-0803 - (301) 320-0899 | 74 |
| (301) 320-09** | (301) 320-0900 - (301) 320-0999 | 70 |
US Phone Directory: (301) 320-0***
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