Concern has been expressed for many years over the decrease in numbers of both Western Bluebirds (Sialia mexicana) and Mountain Bluebirds (S. currucoides) in Washington. One major problem in attempting to document this reported decline is the lack of comprehensive status and distribution data. Seasonal reports in American Birds provide summaries of observations but often these are not quantitative in nature. Recent breeding bird surveys conducted by the U.S. Fish and Wildlife Service (Robbins and Van Velzen 1969, Van Velzen and Robbins 1971) are quantitative but often provide only limited data on bluebirds. The purpose of this study is to supply quantitative information on the status and distribution of both bluebird species in Washington for the summer of 1974, to provide an analysis of Breeding Bird Survey (BBS) data for 1968 through 1976, and to evaluate population trends during the past 80 years.