| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (410) 400-00** | (410) 400-0000 - (410) 400-0099 | 19 |
| (410) 400-01** | (410) 400-0104 - (410) 400-0192 | 25 |
| (410) 400-02** | (410) 400-0203 - (410) 400-0296 | 29 |
| (410) 400-03** | (410) 400-0308 - (410) 400-0396 | 23 |
| (410) 400-04** | (410) 400-0464 - (410) 400-0491 | 6 |
| (410) 400-05** | (410) 400-0500 - (410) 400-0593 | 33 |
| (410) 400-06** | (410) 400-0602 - (410) 400-0690 | 31 |
| (410) 400-07** | (410) 400-0700 - (410) 400-0796 | 27 |
| (410) 400-08** | (410) 400-0804 - (410) 400-0899 | 33 |
| (410) 400-09** | (410) 400-0906 - (410) 400-0997 | 27 |
US Phone Directory: (410) 400-0***
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