What state is West Rancho Dominguez in?

CA (per US Census Bureau place classification).

What county is West Rancho Dominguez, CA in?

Los Angeles County (per US Census Bureau geographic hierarchy).

Decision depends on per-source match: education 36th percentile (ValiFit reports each source independently; weighting is up to you).

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West Rancho Dominguez, CA: 20/100 Score | Schools 36/100 — ValiFit