About Guidonia Montecelio
Guidonia Montecelio is a city in Lazio, Italy with a population of 89,165. It is the 52nd largest of the 596 cities of 15,000 or more listed in Italy, and the 6,461st largest worldwide. It lies 21 km from Rome.
Key Facts
Country
Region
Rank in region
#3of 45
Coordinates
41.994, 12.722
Record updated
7 May 2026
Entry edited, not measured
City population, GeoNames. GeoNames publishes no year for its population figures, so “record updated” is when the entry was last edited — not the date the population was measured. Elevation is modelled from a digital elevation model rather than surveyed, so it is approximate.
Nearby Cities
All 596 in ItalyClosest listed cities by great-circle distance from the city centre.