- Cairo
- Caledonia
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- Camillus
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- Carle Place
- Carmel
- Carthage
- Castleton
- Cato
- Catskill
- Cazenovia
- Cedarhurst
- Center Moriches
- Centereach
- Central Islip
- Central Square
- Central Valley
- Champlain
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- Copiague
- Coram
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- Cortlandt Manor
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- Cuba
- Cutchogue