Mill City, OR — rate center
Mill City is a telephone rate center in Oregon served by area codes 503, 971. A rate center is the locality the phone industry uses to anchor numbers for billing; every prefix listed below is registered here.
NANPA records show 3 active prefixes here, held by 3 different carriers. Pooling applies to 3 of them — individual thousands-blocks may belong to different companies.
Routing-wise it sits in LATA 672.
Because 503, 971 all serve this territory, two Mill City numbers can look completely different while being neighbors — check the prefix, not just the area code.
Mill City is a small rate center: 3 prefixes across 3 carriers serve it. Small localities like this often keep the same blocks for decades, so the prefix-to-place mapping tends to be stable.
As always with US numbering: a prefix anchored to Mill City 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 Mill City
| Prefix | Code holder | Pooled |
|---|---|---|
| 503-897 | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | Yes |
FAQ
What area code is Mill City, OR?
Mill City is served by 2 area codes — 503, 971 — which overlay the same territory.
How many prefixes does Mill City have?
3 active NXX prefixes are anchored to this rate center in NANPA records, held by 3 carriers.
Is a call from a Mill City prefix really from Mill City?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.