Castellón Province, Spain

With 627,173 people on January 1, 2025, Castellón province ranks 26th by population and 38th by area among Spain’s 50 provinces. Since 2015 it has gained 44,846 people (7.7%). Density is 95 people/km², against a Spanish average of 97 people/km².

The capital, Castellón de la Plana, has 183,711 residents, 29% of the province. Next come Vila-real (53,623), Burriana (37,915), and la Vall d'Uixó (32,242).

Of its 135 municipalities (the 28th most of any province), 87 have fewer than 1,000 people. The smallest by population is Castell de Cabres, with 21, and the largest by area is Morella, at 414 km².

The capital, Castellón de la Plana, sits 28 m (92 ft) above sea level, the 18th lowest of Spain’s 52 provincial capitals and autonomous cities.

According to the IGN’s summit table, the highest point in Castellón province is Penyagolosa, at 1,812 m (5,945 ft), in the Massís de Penyagolosa. It’s 37 km from the capital in a straight line and 1,784 m higher.

Besides the capital, one city over 50,000 people has its own elevation page: Vila-real (41 m).

7 towns of 20,000 to 50,000 people also have a page. The highest is Onda (192 m) and the lowest, Vinaròs (7 m); they’re all in the list.

Castellón is one of the 3 provinces of the Valencian Community, along with Alicante and Valencia. See Valencian Community: its provinces, population and peaks.