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2025 Compare Cities Politics & Voting:
Foster City, CA vs Boulder, CO

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Highlights
- Registered voters in Boulder are 7.0% less likely to be registered as Democrats than registered voters in Foster City.
- Registered voters in Foster City, are 36.5% more likely to be registered as Democrats, than in the rest of the United States.
 Foster City, CABoulder, COUnited States
 Democrat  Unlock70.3%48.0%
 Republican18.4%  Unlock45.9%
 Independent Other  Unlock7.7%6.0%
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Learn More About Foster City, California
Overview
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Voting
Learn More About Boulder, Colorado
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