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Arock, Oregon
Arock, Oregon is located in Oregon
Arock, Oregon
Arock, Oregon
Location in Oregon
Arock, Oregon is located in the United States
Arock, Oregon
Arock, Oregon
Location in the United States
Country United States
State Oregon
County Malheur
3,727 ft (1,136 m)
Time zone UTC-7 (Mountain)
 • Summer (DST) UTC-6 (Mountain)
ZIP Code
Area code(s) 541
GNIS feature ID 1117045
Coordinates and elevation from Geographic Names Information System

Arock is an unincorporated community in Malheur County, Oregon, United States. It is part of the Ontario, OR–ID Micropolitan Statistical Area. Arock is along Arock Road, 3 miles (5 km) north of U.S. Route 95 between Jordan Valley and Rome. Jordan Creek flows near Arock and joins the Owyhee River just west of Arock.

Arock was supposedly named in 1922 for a large rock bearing Native American petroglyphs in the vicinity. Arock post office was established in 1926. Its ZIP Code is 97902.

The oldest building in Malheur County, Sheep Ranch Fort, is near Arock. It was added to the National Register of Historic Places in 1974. Arock is one of several places in southeast Oregon that were settled by Basque herders.


According to the Köppen Climate Classification system, Arock has a semi-arid climate, abbreviated "BSk" on climate maps.

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