Idaho Address Generator

Idaho is one of the few states a timestamp cannot be derived from. Federal regulation puts the northern panhandle on Pacific time and the rest of the state on Mountain time, and 49 CFR § 71.9 draws the line along the Idaho–Montana boundary, down the border between Idaho County and Lemhi County, then west along the main channel of the Salmon River to the Oregon line. Idaho County is cut by that description rather than assigned by it, so the split is not even clean at the county level, let alone the state level.

That matters the moment software maps a postal code to a local time. Idaho holds 320 codes under seven prefixes, and the largest, 838 around Coeur d'Alene, sits in the panhandle on Pacific time, while the capital's prefix, 837 around Boise, is on Mountain time and carries 29 codes — second-fewest in the state. A lookup table keyed on the two-letter state code will therefore be an hour wrong for a substantial share of Idaho addresses, and it will be wrong for the busiest prefix the state has. Time zone rules belong in a maintained database such as the IANA tzdb, not in a state-to-offset map.

Seven prefixes is itself unusual — among the smallest counts in the country — and they run 832 to 838 without a gap. Spread over 44 counties, that gives roughly seven codes per county, so an Idaho fixture is small enough to enumerate honestly rather than sample. The trade is that each prefix covers a great deal of ground: 835 is principal-placed at Ahsahka and 833 at Sun Valley, neither of which is a large settlement, because the name attaches to the sorting area rather than to a population centre.

For test data, Idaho earns its place as the state that breaks the assumption that geography is settled by the state field. A record needs its county, or at least its ZIP, before anything can be said about its local time. If the fixture only needs valid postal values, the ZIP code generator covers that; if it needs the whole address, Montana and Oregon make useful neighbours to test alongside, since the boundary in the regulation is defined against both.

Random Idaho phone numbers here use the state's real area codes — 208 and 986 — with the 555-01XX line range the North American Numbering Plan reserves for fiction, so a number such as (208) 555-0110 passes format and area-code checks yet can never ring anyone. Every profile this page generates carries one that agrees with its Idaho address; for a batch of numbers on their own, the random Idaho phone number generator draws from the same range with any US area code.

Three examples in the reserved range: (208) 555-0110, (986) 555-0184, (208) 555-0163. Area codes are geographic, so a Idaho address paired with a non-ID area code fails the consistency check that fraud systems and good validators run — which is why this page pins both to Idaho. How area codes are assigned, and why the 555 block exists, are covered in how US area codes work and why fake phone numbers start with 555.