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

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Highlights
- Registered voters in Castle Rock are 45.6% less likely to be registered as Democrats than registered voters in Mercer Island.
- Registered voters in Mercer Island, are 31.2% more likely to be registered as Democrats, than in the rest of the United States.
 Mercer Island, WACastle Rock, WAUnited States
 Democrat  Unlock38.0%48.0%
 Republican21.0%  Unlock45.9%
 Independent Other  Unlock10.7%6.0%
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Learn More About Mercer Island, Washington
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Learn More About Castle Rock, Washington
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