Map of Guidonia Montecelio, Italy

Guidonia Montecelio is a city in Lazio, Italy, with a population of about 89,165. It lies at 41.9936°N, 12.7224°E. Guidonia Montecelio is about 21 km (13 mi) northeast of Rome, the capital. The nearest city on our map is Monterotondo, 11 km to the northwest.

Guidonia Montecelio at a glance

Where is Guidonia Montecelio?

• The 3rd largest city in Lazio on this site.
• Located in the Northern and Eastern hemispheres.
• Daylight ranges from about 9 h 07 min on the shortest day to 15 h 14 min on the longest day (around 21 December and 21 June).

Cities near Guidonia Montecelio

• Monterotondo — 11 km northwest
• Rome — 21 km southwest
• Ciampino — 24 km southwest
• Vatican City — 24 km southwest, Vatican City
• Marino — 25 km south
• Velletri — 35 km south
• Acilia-Castel Fusano-Ostia Antica — 41 km southwest
• Aprilia — 45 km south
• Lido di Ostia — 47 km southwest
• Rieti — 47 km north

Largest cities in Lazio

• Rome — 2,318,895
• Acilia-Castel Fusano-Ostia Antica — 129,362
• Lido di Ostia — 85,301
• Fiumicino — 80,738
• Latina — 76,305
• Aprilia — 74,977
• Velletri — 52,911
• Nettuno — 49,873
• Civitavecchia — 47,543
• Viterbo — 47,134

Largest cities in Italy

• Rome — 2,318,895
• Milan — 1,371,498
• Naples — 909,048
• Turin — 847,287
• Palermo — 648,260
• Genoa — 580,097
• Bologna — 394,843
• Florence — 367,150
• Bari — 316,491
• Catania — 311,584

Map of Italy and all its cities →

Sources: place names, coordinates, populations and time zones from GeoNames (CC BY 4.0, data retrieved October 2026). Population figures are the latest values recorded in GeoNames; depending on the country they refer to the city proper, a municipality or a wider urban area, so they can differ from census or metro-area figures. Map © OpenStreetMap contributors.