I like the following data by high school/transfer college:
Top Ten Institutions of Origin of New Freshmen and New Undergraduate Transfers - 2005 Fall Quarter http://planning.ucsc.edu/irps/Studen...nsfers-A7a.pdf
# of students
____________
40 LOWELL HS
34 LINCOLN HS
30 BERKELEY HS
29 SIR FRANCIS DRAKE HS
23 WASHINGTON HS
20 ALBANY HS
20 TAMALPAIS HS
20 PALO ALTO HS
19 DAVIS SENIOR HS
19 GUNN HS
142 CABRILLO COLL
057 DE ANZA COLL
038 DIABLO VALLEY COLL
030 SANTA ROSA JR COLL
023 FOOTHILL COLL
021 CC OF SAN FRANCISCO
020 MONTEREY PENINSULA COLL
019 SANTA BARBARA CC
019 WEST VALLEY COLL
018 SANTA MONICA COLL
Many of the high schools are in very affluent and/or liberal areas (San Francisco, Berkeley, Palo Alto, Marin County).