First large number of settlers arrived in Oregon and Willamette Valley, having traveled over the Oregon Trail.
Future site of "Corvallis" and "Oregon State University," near the confluence of the Willamette and Marys Rivers, first settled by Joseph C. Avery in October.
Benton County was established on December 23. It originally encompassed 18,660 square miles, from the southern border of Polk County to the California line.
Oregon became a territory of the United States on August 14. (Abraham Lincoln was asked to be governor of the Territory of Oregon.)
Territorial Census in Oregon: 9,083.