Plana Alta (Valencian: [ˈplana ˈalta]; Spanish: [ˈplana ˈalta]) is a comarca in the province of Castellón in the Valencian Community, Spain.

The largest town in the comarca is Castellón de la Plana, which is also the capital and largest town in the province.

The comarca comprises 17 municipalities, listed below with their populations at the 2001 and 2011 Censuses and according to the latest official estimates:

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