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2026 Compare Cities Politics & Voting:
Costa Mesa, CA vs Ontario, CA

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Highlights
- Registered voters in Ontario are 2.3% more likely to be registered as Democrats than registered voters in Costa Mesa.
- Registered voters in Costa Mesa, are 5.7% more likely to be registered as Democrats, than in the rest of the United States.
 Costa Mesa, CAOntario, CAUnited States
 Democrat  Unlock52.1%48.0%
 Republican42.3%  Unlock45.9%
 Independent Other  Unlock6.4%6.0%
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Learn More About Costa Mesa, California
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Learn More About Ontario, California
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