Clarksburg is a census-designated place in Yolo County, California. It is located on the Sacramento River, in the extreme southeastern corner of the county.
Clarksburg has been settled in stages dating back as early as the 1850s when Merritt Island was first cleared and developed for agricultural uses. Postal authorities first established a post office in 1876, under the name "Clarksburgh" and changed the name to "Clarksburg" in 1893.The town was named after Robert C. Clark who settled at the place in 1849.In the 1920s the New Holland Land Company began subdividing the tracts in the area and formally established Clarksburg as an unincorporated community. Clarksburg is unique among small California towns in that many of the families who initially settled the area are still present, thus lending a small-town charm to the community.