This list presents the full set of buildings, structures, objects, sites, or districts designated on the National Register of Historic Places in Gilliam County, Oregon, and offers brief descriptive information about each of them. The National Register recognizes places of national, state, or local historic significance across the United States.  Out of over 90,000 National Register sites nationwide,  Oregon is home to over 2,000,  and 3 of those are found in Gilliam County.
|||Name on the Register||Image||Date listed ||Location||City or town||Description|
|1||S. B. Barker Building||February 21, 1989
|333 S. Main Street||Condon||Built in 1903 at the center of downtown Condon, this Italianate general store typifies the mercantile businesses serving ranches and farms throughout eastern Oregon in the early part of the 20th century. Its early proprietors, Simon Bradbury Barker (owner 1903–1918) and James Dunn Burns (owner 1926–1986), were leading economic and political figures in Gilliam County, and Barker became a prominent businessman statewide. |
|2||Condon Commercial Historic District||May 29, 1998
|Roughly along Main Street between Frazer Street and Spring Street||Condon|
|3||Silas A. Rice Log House||October 31, 1991
Oregon Route 19 at Burns Park||Condon|
- National Register of Historic Places listings in Oregon
- Listings in neighboring counties: Klickitat, Morrow, Sherman, Wasco, Wheeler
- Historic preservation
- History of Oregon
- Lists of Oregon-related topics
- Andrus, Patrick W.; Shrimpton, Rebecca H.; et al. (2002), How to Apply the National Register Criteria for Evaluation, National Register Bulletin (15), National Park Service, U.S. Department of the Interior, OCLC 39493977, archived from the original on April 6, 2014, retrieved June 20, 2014.
- National Park Service, National Register of Historic Places Program: Research, archived from the original on February 1, 2015, retrieved January 28, 2015.
- Oregon Parks and Recreation Department, Oregon Historic Sites Database, retrieved August 6, 2015. Note that a simple count of National Register records in this database returns a slightly higher total than actual listings, due to duplicate records. A close reading of detailed query results is necessary to arrive at the precise count.
- "National Register of Historic Places: Weekly List Actions". National Park Service, United States Department of the Interior. Retrieved on March 7, 2019.
- Numbers represent an ordering by significant words. Various colorings, defined here, differentiate National Historic Landmarks and historic districts from other NRHP buildings, structures, sites or objects.
- The eight-digit number below each date is the number assigned to each location in the National Register Information System database, which can be viewed by clicking the number.
- Sargent, Gail A. (August 15, 1988), National Register of Historic Places Registration Form: Barker, S. B., Building (PDF), retrieved October 27, 2013.