Mendocino County, California
county in northwestern California, United States
Mendocino County ( ; Mendocino, Spanish for "of Mendoza") is a county located on the North Coast of the U.S. state of California. As of the 2020 United States census, the population was 91,601. The county seat is Ukiah.
Mendocino County consists wholly of the Ukiah, California Micropolitan Statistical Area (μSA) for the purposes of the U.S. Census Bureau. It is located approximately equidistant from the San Francisco Bay Area and California/Oregon border, separated from the Sacramento Valley to the east by the California Coast Ranges. While smaller areas of redwood forest are found farther south, it is the southernmost California county to be included in the World Wildlife Fund's Pacific temperate rainforests ecoregion, the largest temperate rainforest ecoregion on Earth.
The county is noted for its distinctive Pacific Ocean coastline, its location along California's "Lost Coast", redwood forests, wine production, microbrews, and liberal views about the use of cannabis and support for its legalization. In 2009, it was estimated that roughly one-third of the economy was based on the cultivation of marijuana.
Mendocino is one of three Northern California counties to make up the "Emerald Triangle", along with Humboldt and Trinity counties.
History
Mendocino County was one of the original counties of California, created in 1850 at the time of statehood.
This brief starts where responsible research should: with the source description of “Mendocino County, California” as county in northwestern California, United States. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the places & architecture register because the source frames it as county in northwestern California, United States. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Maps, plans, fabric surveys and administrative records can establish how the site’s name, extent and function changed over time. The source revision retrieved here is dated Sep 24, 2026. The linked authority identifier is Q108087. VIAF identifies the subject as 153618076. The Library of Congress control number is n81108777. Authority coordinates are 39.430, -123.430. 5 of 5 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank. The first chronological checks are 2020, 2009 and 1850.
Modern boundaries and familiar names can conceal earlier jurisdictions or structures that do not align with the present site. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “Mendocino County, California”, its source revision and the description used here.
- Expand the search: follow Mendocino County, California primary sources, Mendocino County, California archive and Mendocino research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Mendocino County, California”?
- Which earlier names or jurisdictions may reveal additional records?
- Which authority defined the place, boundary or structure at the relevant date?
Search terms from this dossier
This entry incorporates text from “Mendocino County, California” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.