Downtown in Boise in Ada County, Idaho — The American West (Mountains)

U.S. Assay Office

Photographed by Douglass Halvorsen, July 4, 2026

1. U.S. Assay Office Marker

Inscription.
This is the old U.S. Assay Office
Built in 1870-71, and said to have
received more than 75,000,000 dollars
in gold and silver through its doors

Topics. This historical marker is listed in this topic list: Notable Buildings. A significant historical year for this entry is 1870.

Location. 43° 36.759′ N, 116° 11.8′ W. Marker is in Boise, Idaho, in Ada County. It is in Downtown. It is on West Main Street, on the right when traveling west. Touch for map. Marker is at or near this postal address: 210 W Main St, Boise ID 83702, United States of America. Touch for directions.

Regionally, this marker is on Idaho’s Snake River Plain.

It is also in the American Mountain West.

Globally, it is in North America,

the Western Hemisphere,

the Western World,

and the Anglosphere.

Other nearby markers. At least 8 other markers are within walking distance of this marker: Assay Office (here, next to this marker); Treasure to Timber: A Site in Transition (within shouting distance of this marker); A Lasting Legacy (within shouting distance of this marker); A Close Call (within shouting distance of this marker); “Silver & Gold in the Sunlight Blaze”

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(within shouting distance of this marker); “Lovely Lawns Carefully Kept” (within shouting distance of this marker); Working from Home (within shouting distance of this marker); A Capital Investment (within shouting distance of this marker). Touch for a list and map of all markers in Boise.

More about this marker. The marker is located to the right of the main entrance.

Photographed by Douglass Halvorsen, July 4, 2026

2. U.S. Assay Office Marker

Photographed by Douglass Halvorsen, July 4, 2026

3. U.S. Assay Office Marker

U.S. Assay Office, 1961 image. Click for full size.

4. U.S. Assay Office, 1961

This photo is taken from the National Register of Historic Places Nomination-Inventory Form for the Assay Office. The historical marker can be seen in this photo from 1961.

Credits. This page was last revised on July 11, 2026. It was originally submitted on July 10, 2026, by Douglass Halvorsen of Klamath Falls, Oregon. This page has been viewed 8 times since then. Photos: 1, 2, 3, 4. submitted on July 10, 2026, by Douglass Halvorsen of Klamath Falls, Oregon. • Andrew Ruppenstein was the editor who published this page.