Nyssa ( ) is a city in Malheur County, Oregon, United States. The population was 3,198 at the 2020 census. Successful yields led to the first Amalgamated-designed and built factory, which began operation on October 9, 1938.
Near the end of the war, a branch camp for German and Italian prisoners of war from Camp Rupert, near Buhl, Idaho, was established. Those POWs helped with the sugar beet industry, typically through thinning and harvesting. The Nyssa plant just a few years previously had produced more sugar than anywhere else for Amalgamated Sugar. To date the plant has been stripped of everything except the brown sugar line. The mechanic shop is still running. Beets are shipped to Nampa, Idaho. Nyssa also had a greenhouse and testing facilities which were later moved to Twin Falls.
thumb|Nyssa looking east with the Snake River and Idaho visible in the background
Geography
Nyssa is in eastern Oregon, on the west bank of the Snake River, which forms the border with Idaho. It is south of Ontario, Oregon, and northwest of Caldwell, Idaho.
Combined U.S. Routes 20 and 26 pass through Nyssa, leading southeast to Parma and Caldwell in Idaho, and northeast to Vale. Oregon Route 201 leads south from Nyssa to Adrian and north to Ontario.
According to the U.S. Census Bureau, Nyssa has a total area of , all of it land.