| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 312-80** | (301) 312-8000 - (301) 312-8098 | 83 |
| (301) 312-81** | (301) 312-8100 - (301) 312-8199 | 88 |
| (301) 312-82** | (301) 312-8200 - (301) 312-8299 | 88 |
| (301) 312-83** | (301) 312-8300 - (301) 312-8399 | 95 |
| (301) 312-84** | (301) 312-8400 - (301) 312-8499 | 79 |
| (301) 312-85** | (301) 312-8500 - (301) 312-8598 | 82 |
| (301) 312-86** | (301) 312-8600 - (301) 312-8699 | 91 |
| (301) 312-87** | (301) 312-8700 - (301) 312-8799 | 91 |
| (301) 312-88** | (301) 312-8800 - (301) 312-8898 | 86 |
| (301) 312-89** | (301) 312-8900 - (301) 312-8999 | 86 |
US Phone Directory: (301) 312-8***
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