Comune in Campania, Italy Grumo Nevano Comune Basilica of San Tammaro at Grumo Nevano. Coat of arms Location of Grumo Nevano Grumo Nevano Location of Grumo Nevano in Italy Show map of Italy Grumo Nevano Grumo Nevano (Campania) Show map of Campania Coordinates: 40°56′N 14°16′E﻿ / ﻿40.933°N 14.267°E﻿ / 40.933; 14.267Coordinates: 40°56′N 14°16′E﻿ / ﻿40.933°N 14.267°E﻿ / 40.933; 14.267 Country Italy Region Campania Metropolitan city Naples (NA) Government • Mayor Gaetano Di Bernardo Area [1] • Total 2.9 km2 (1.1 sq mi) Elevation 53 m (174 ft) Population (31 August 2015)[2] • Total 18,058 • Density 6,200/km2 (16,000/sq mi) Demonym(s) Grumesi, Nevanesi Time zone UTC+1 (CET) • Summer (DST) UTC+2 (CEST) Postal code 80028 Dialing code 081 Patron saint San Tammaro Saint day January 16 Website Official website