Detroit, OR — rate center
The Detroit rate center (Oregon) anchors 2 active prefixes under area codes 503, 971. Rate centers, not city limits, are what phone numbers are legally tied to.
NANPA records show 2 active prefixes here across 2 carriers. 2 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.
With only 2 prefixes, Detroit sits at the small end of Oregon's rate centers — a handful of carrier blocks cover the whole locality, and a number from here is a fairly strong locality signal (before porting is considered).
As always with US numbering: a prefix anchored to Detroit tells you where the block was issued. The person calling may have ported the number, moved away, or be spoofing it entirely — verify callers through independently found contact details.
Prefixes anchored to Detroit
| Prefix | Code holder | Pooled |
|---|---|---|
| 503-854 | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | Yes |
FAQ
What area code is Detroit, OR?
Detroit is served by 2 area codes — 503, 971 — which overlay the same territory.
How many prefixes does Detroit have?
2 active NXX prefixes are anchored to this rate center in NANPA records, held by 2 carriers.
Is a call from a Detroit prefix really from Detroit?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.