Short answer:
Berkeley, Stanford, Oregon, Oregon State, USC, UCLA, Washington,Washington state.
Long answer:
The history of the Pac-8/10/12 began with the Pacific Coast Conference (PCC).
1915: PCC was founded with four original members - the University of California at Berkeley, the University of Washington, the University of Oregon, and Oregon State College (now Oregon State University).
1917: Washington State College (now Washington State University) joined.
1918: Stanford University joined.
1922: University of Southern California (USC) and the University of Idaho joined.
1924: University of Montana joined.
1928: UCLA joined.
1950: Montana resigned.
1958: Dissolution of PCC.
1959: Reformed as the Athletic Associates of Western Universities (AAWU). Original AAWU membership included UC Berkeley, Stanford, USC, UCLA and Washington.
1962: Washington State joined.
1964: Oregon and Oregon State joined.
1968: The name Pacific-8 Conference was adopted.
1978: University of Arizona and Arizona State University joined. Named the Pacific-10 Conference.
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