Dallas, OR — rate center
Phone numbers "from Dallas" are, precisely speaking, numbers whose prefixes are anchored to the Dallas rate center of Oregon, under 503, 971.
The rate center currently carries 12 working prefixes across 6 carriers. 10 prefixes participate in thousands-block pooling, so blocks of 1,000 numbers are shared between carriers.
Routing-wise it sits in LATA 672.
Multiple area codes over one rate center (503/971) is the overlay pattern: same geography, different first three digits.
A Dallas prefix on caller ID is a starting point, not proof of origin — numbers travel with their owners and displays can be spoofed. Use official callback numbers for anything sensitive.
Prefixes anchored to Dallas
| Prefix | Code holder | Pooled |
|---|---|---|
| 503-420 | T-MOBILE USA, INC. | Yes |
| 503-606 | QWEST CORPORATION | Yes |
| 503-623 | QWEST CORPORATION | No |
| 503-751 | QWEST CORPORATION | Yes |
| 503-831 | QWEST CORPORATION | Yes |
| 503-837 | ONVOY, LLC - OR | Yes |
| 503-838 | QWEST CORPORATION | No |
| 503-917 | T-MOBILE USA, INC. | Yes |
FAQ
What area code is Dallas, OR?
Dallas is served by 2 area codes — 503, 971 — which overlay the same territory.
How many prefixes does Dallas have?
12 active NXX prefixes are anchored to this rate center in NANPA records, held by 6 carriers.
Is a call from a Dallas prefix really from Dallas?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.