Provinces  of  Lazio

Latest page update: 6 March 2025
​By Dion Protani
The five provinces of Lazio start with the Metropolitan City of Rome which is the largest by every measure. It has the largest population at 4.3 million, covers the greatest territory at 5,352 km² and has the highest number of comunes at 121. 

There are 20 regions of Italy of which Lazio is one and within 18 of those regions there are then a series of provinces. The comunes are the smaller towns and in some case villages whereas the provinces are typically named after the major city or town in a particular area. The remaining four provinces of Lazio are named after the cities of Frosinone, Latina, Rieti and Viterbo. 
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Metropolitan  City  of  Rome

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Ostia Antica, Metropolitan City of Rome
Provincial capital: Rome
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Population: 4,320,292

Size: 5,352 km²

Comunes: 121

Code: RM

Highlights: ​​Lake Bracciano, Ostia Antica, Castel Gandolfo, Frascati

Frosinone  Province

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Montecassino Abbey, Frosinone Province
Provincial capital: Frosinone
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Population: 464,988

Size: 3,247 km²

Comunes: 91

Code: FR

Highlights: ​​Montecassino Abbey, Anagni, Ceccano, Sora, Fiuggi

Latina  Province

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Formia, Latina Province
Provincial capital: Latina
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Population: 566,485

Size: 2,256 km²

Comunes: 33

Code: LT

Highlights: ​​Ponza, Sermoneta, Gaeta, Circeo National Park

Rieti  Province

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Castel di Tora, Rieti Province
Provincial capital: Rieti
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Population: 150,320

Size: 2,751 km²

Comunes: 73

Code: RI

Highlights: ​​Castel di Tora, Greccio, Collalto Sabino, Leonessa

Viterbo  Province

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Tarquinia, Viterbo Province
Provincial capital: Viterbo
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Population: 308,187

Size: 3,615 km²

Comunes: 60

Code: VT

Highlights: ​​Cività di Bagnoregio, Tuscania, Villa Lante, Tarquinia

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