Title 24 Reports in Del Norte County

A short list with one exception

Del Norte's ZIP list is short: five ZIP codes. Four are zone 1, and they follow the shoreline — Smith River close to the Oregon line, Fort Dick, Crescent City itself, and Klamath at the southern end.

The odd one out is 95543, Gasquet's ZIP code, which is zone 16. One ZIP code is normally too little for us to credit a county with a zone, but this one sits entirely inside Del Norte, so there is no split to argue over. The mountain zone is a real part of the county.

Counted this way, no other California county pairs zone 1 with zone 16. The two sit at opposite ends of the Energy Commission's numbering, and in Del Norte they share a river.

US 199 crosses the line

US 199 leaves the coast just north of Crescent City and follows the Smith River inland toward Grants Pass. Hiouchi, near the start of that road, is still covered by the Crescent City ZIP code and is zone 1. Gasquet, further upriver, is zone 16: the mountain classification, applied here to a river valley not far from the sea.

Nothing on the drive marks the change, which is why we settle the zone from the address rather than from the view through the windscreen. A house plan carried from the fog belt up to Gasquet gets recalculated against mountain targets, not resubmitted.

Crescent City, and everywhere else

Crescent City is the only incorporated city in Del Norte County on the California Department of Finance's 2026 population estimates. Inside its limits the city issues the permit. Smith River, Hiouchi, Gasquet, Klamath: everything else is unincorporated, so the county handles it. The city lies wholly in zone 1 and never sees a zone 16 project.

Every ZIP code by zone

Zones per the Energy Commission; county membership and community names per the 2020 Census.

• Climate zone 1 — 95531 (Crescent City, Hiouchi, Fort Dick); 95538 (Fort Dick); 95548 (Klamath); 95567 (Smith River)
• Climate zone 16 — 95543 (Gasquet)

No ZIP code here is split

Every one lies wholly inside Del Norte by Census land area, so for this county the line on the map and the ZIP code never disagree.

Finding the zone for your own project

The zone is set by the project's location and confirmed from the ZIP code against the Energy Commission's published table — not from the county name and not from the nearest large town. Because Del Norte County contains more than one zone, that check decides which set of numbers a report is written against.

Give us the project address and we determine the zone as part of preparing the report. It is the first thing established, because every insulation, glazing and equipment figure downstream depends on it.

Climate zones in Del Norte County

Del Norte County contains California climate zones 1 and 16. The zone drives the insulation, glazing and equipment performance a report has to demonstrate, and it is confirmed from the project ZIP code against the Energy Commission's published table.