| Official Name: | Arock, Oregon |
| Settlement Type: | Unincorporated community |
| Postal Code Type: | ZIP Code |
| Postal Code: | 97902 |
| Pushpin Map: | USA Oregon#USA |
| Pushpin Map Caption: | Location within the state of Oregon |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Oregon |
| Subdivision Type2: | County |
| Subdivision Name2: | Malheur |
| Timezone: | Mountain |
| Utc Offset: | -7 |
| Timezone Dst: | Mountain |
| Utc Offset Dst: | -6 |
| Area Code: | 541 |
| Coordinates: | 42.9142°N -117.5253°W |
| Elevation Ft: | 3727 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1117045[1] |
| Footnotes: | Coordinates and elevation from Geographic Names Information System |
Arock is an unincorporated rural hamlet in Malheur County, Oregon, United States.[1] It is part of the Ontario, OR - ID Micropolitan Statistical Area. There is a post office and K-8 school in Arock, and Jordan Creek flows near Arock and joins the Owyhee River just west of Arock.[2]
Arock was supposedly named in 1922 for a rock bearing Native American petroglyphs in the vicinity.[3] Arock post office was established in 1926 and serves ZIP Code 97902.[3]
The oldest building in Malheur County, Sheep Ranch Fort, is near Arock.[4] It was added to the National Register of Historic Places in 1974.[5] Arock is one of several places in southeast Oregon that were settled by Basque herders.[4]
According to the Köppen Climate Classification system, Arock has a semi-arid climate, abbreviated "BSk" on climate maps.[6]
Arock School District No. 81 serves the community. It is a K-8 school and has two teachers, one for elementary and one for junior high school.[7] The school is named W. W. Jones Elementary School.[8]