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2025 Compare Cities Politics & Voting:
Castle Rock, CO vs Mercer Island, WA

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Highlights
- Registered voters in Mercer Island are 90.7% more likely to be registered as Democrats than registered voters in Castle Rock.
- Registered voters in Castle Rock, are 31.2% less likely to be registered as Democrats, than in the rest of the United States.
 Castle Rock, COMercer Island, WAUnited States
 Democrat  Unlock69.8%48.0%
 Republican54.7%  Unlock45.9%
 Independent Other  Unlock9.1%6.0%
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Learn More About Castle Rock, Colorado
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Learn More About Mercer Island, Washington
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