Daga ƙidayar shekara ta 2000, akwai mutane 563,598, gidaje 181,629 da iyalai 134,768 da ke zaune a gundumar. Yawan jama'a ya kai mutane 403 a kowace murabba'in kilomita (156/km2). Akwai gidaje 189,160 a matsakaicin matsakaicin 135 a kowace murabba'in kilomita (52/km2). Ra'ayin launin fata na gundumar ya kasance 58.1% White, 6.7% Black ko African American, 1.1% Native American, 11.4% Asian, 0.4% Pacific Islander, 16.3% daga wasu tsere, da 6.1% daga biyu ko fiye da tsere. 30.5% na yawan jama'a sun kasance Hispanic ko Latino na kowane tsere. 9.3% sun kasance Jamusanci, 5.3% Irish da 5.0% na asalin Ingilishi bisa ga Census na 66.4% Ingilishi, 21.3% na magana da Mutanen Espanya, 2.2% Tagalog, 1.8% ko Mon-Khmeran, da kuma 1.1% Vietnamese a matsayin yarensu na farko. Tambaya: Mene ne mafi girma a cikin gundumar?
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