Oregon (OR) is the only sales-tax-free state on the West Coast. If your test persona lives anywhere near California or Seattle, an Oregon address is geographically believable in a way Delaware is not — the ZIP starts with 97 and sits next to 9xxxx California ranges, so nothing about it raises an eyebrow.
| Scenario | Pick | Reason |
|---|---|---|
| Persona on the West Coast | Oregon OR | Adjacent to CA/WA; 97-prefixed ZIPs look natural |
| Cleanest possible rules | Oregon OR | 0% state, no local sales tax — no exceptions to remember |
| Most ordinary-looking address | Delaware DE | Highest occurrence rate in commercial systems |
| Large batches of rows | Mix both | Diversifies the data; avoids single-state clustering |
| Item | Value |
|---|---|
| Abbreviation | OR |
| State sales tax / local add-on | None / none |
| Largest cities | Portland, Eugene, Salem, Gresham, Bend |
| ZIP range | 97xxx (statewide) |
| Area codes | 503 / 541 / 971 (503 and 971 cover the Portland metro) |
The rule for test addresses is the more ordinary, the better — big-city addresses are common in real traffic and never surprise a risk system. The Portland metro area (Portland, Gresham, Hillsboro, Beaverton) has the richest street data in the state and produces the most natural address shapes. Eugene and Salem are a solid second tier. What to avoid: resort-style small towns like Sunriver, where addresses are rare — and rarity is exactly what stands out.
Bottom line: Oregon and Delaware are equivalent on the tax question. The choice is a geography story — if your test data claims the West Coast, use OR.
Yes — 0% state sales tax and no local sales tax anywhere, which puts Oregon (with Delaware) in the no-exceptions club of the five.
It is a believability detail: 97-prefixed ZIPs sit next to California's 9xxxx ranges, so a west-coast persona never looks contradicted. It also lets you eyeball state-ZIP consistency at a glance.
The rules are equally clean; pick by geography. West-coast story: OR. East coast or no preference: DE — its addresses are the most common in commercial systems.
No. The Portland metro has dense real street data and its addresses look ordinary. Rare resort-town addresses are what stand out — avoid those instead.