Guidonia Montecelio is a locality located 23.2 km west-southwest from Rome in Lazio, Italy. The population of Guidonia Montecelio is 89,288 people. Aprilia, Fiumicino, Pomezia are located close to Guidonia Montecelio. You can find Guidonia Montecelio on any map using the following decimal coordinates: 41.9968 (latitude), 12.7261 (longitude).