Just to poke - 2009 data according to trulia for the zip code 91324 says there are just over 25K people there. Northridge probably has more than 1 zip code, as many cities do. But - still.......I'd bet that 35% includes some Rubio's.
34.83% of the people in Northridge (zip 91324), CA, claim hispanic ethnicity (meaning 65.17% are non-hispanic).