| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (503) 531-00** | (503) 531-0000 - (503) 531-0000 | 1 |
| (503) 531-01** | (503) 531-0100 - (503) 531-0198 | 61 |
| (503) 531-02** | (503) 531-0200 - (503) 531-0297 | 61 |
| (503) 531-03** | (503) 531-0300 - (503) 531-0399 | 75 |
| (503) 531-04** | (503) 531-0400 - (503) 531-0499 | 72 |
| (503) 531-05** | (503) 531-0500 - (503) 531-0599 | 64 |
| (503) 531-06** | (503) 531-0600 - (503) 531-0699 | 66 |
| (503) 531-07** | (503) 531-0700 - (503) 531-0799 | 69 |
| (503) 531-08** | (503) 531-0802 - (503) 531-0897 | 70 |
| (503) 531-09** | (503) 531-0900 - (503) 531-0999 | 58 |
US Phone Directory: (503) 531-0***
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