NW corner of 3rd and E Sts, Old Town, Eureka (between 2nd and 3rd streets). Under a tree in a little courtyard. (707) 442-3738.
From Discover Historical California:
Established in 1850 to serve the mining camps, Eureka's importance as a lumber shipping port amde it the economic center of the region and by 1856 it was named the county seat of Humboldt County. The town has more than 100 Victorian style homes and restored buildings of various architectural styles built from 1850 to 1902. A guide to some of these building s is available from the Chamber of Commerce.
From the official site plaque:
Eureka: "I have found it!"
Eureka was founded as a town in 1850 and incorporated as a city in 1874. Located on the remote northwestern coast of California, Eureka was the region's major port of entry by water in the nineteenth century, before the construction of good access by land, and rose to historic prominence as the major social, political and economic center of the region. "Eureka" is a Greek expression and a popular mining term meaning "I have found it".
California Registered Historical Landmark No. 477.
Plaque placed by the State Department of Parks and Recreation in cooperation with the ancient and honorable order of E Clampus Vitus Eureka No. 101. September 15, 1979.