Becky M. Nicolaides, My Blue Heaven: Life and Politics in the Working-Class Suburbs of Los Angeles, 1920-1965, Photographs by Robbert Flick. The University of Chicago Press: Chicago, 2002, 1960, 1950, 1939,
"On p. 201, Table 5-2, gives the Santa Monica Median Family Income in 1939 as $2,667, in 1950, $3677, and 1960, $6845." [I'm not sure if these are adjusted dollar amounts.]