Copperfield is a former town in Baker County, in the U.S. state of Oregon. It is on the west bank of the Snake River and the north bank of Pine Creek, downstream of a feature of the Snake River known as The Oxbow. Copperfield Park, managed by Idaho Power, occupies the former town site. The Geographic Names Information System also lists Copperfield as a variant name for Oxbow, Oregon.

Baker County is one of the 36 counties in the U.S. state of Oregon. As of the 2020 census, the population was 16,668. The county seat and largest city is Baker City. The county was organized on September 22, 1862, when a portion of Wasco County was partitioned off. The new county's area was reduced in 1864 when Union County was partitioned off, and again in 1887 when Malheur County was partitioned off. The county's lines were last adjusted in 1901 when a parcel was added to the county.