Comune in Lazio, Italy Arlena di Castro Comune Comune di Arlena di Castro Location of Arlena di Castro Arlena di Castro Location of Arlena di Castro in Italy Show map of Italy Arlena di Castro Arlena di Castro (Lazio) Show map of Lazio Coordinates: 42°27′N 11°49′E﻿ / ﻿42.450°N 11.817°E﻿ / 42.450; 11.817 Country Italy Region Lazio Province Viterbo (VT) Government • Mayor Publio Cascianelli Area [1] • Total 22.3 km2 (8.6 sq mi) Elevation 260 m (850 ft) Population (30 April 2017)[2] • Total 877 • Density 39/km2 (100/sq mi) Demonym Arlenesi Time zone UTC+1 (CET) • Summer (DST) UTC+2 (CEST) Postal code 01010 Dialing code 0761 Patron saint St. Roch Saint day August 16 Website Official website