| Name | Status | Population census 1991-10-20 | Population census 2001-10-21 | Population census 2011-10-09 | |
|---|---|---|---|---|---|
| Frosinone | Province | 479,559 | 484,566 | 492,661 | o |
| Lazio [Latium] | Region | 5,140,371 | 5,112,413 | 5,502,886 |
| Name | Status | Population census 1991-10-20 | Population census 2001-10-21 | Population census 2011-10-09 | |
|---|---|---|---|---|---|
| Acquafondata | Commune | 371 | 316 | 282 | o |
| Acuto | Commune | 1,826 | 1,857 | 1,910 | o |
| Alatri | Commune | 25,038 | 27,068 | 28,609 | o |
| Alvito | Commune | 3,151 | 3,031 | 2,852 | o |
| Amaseno | Commune | 4,110 | 4,228 | 4,314 | o |
| Anagni | Commune | 19,314 | 19,134 | 21,441 | o |
| Aquino | Commune | 5,386 | 5,337 | 5,309 | o |
| Arce | Commune | 6,174 | 6,029 | 5,783 | o |
| Arnara | Commune | 2,515 | 2,454 | 2,379 | o |
| Arpino | Commune | 8,006 | 7,614 | 7,386 | o |
| Atina | Commune | 4,692 | 4,484 | 4,461 | o |
| Ausonia | Commune | 2,501 | 2,563 | 2,650 | o |
| Belmonte Castello | Commune | 781 | 765 | 778 | o |
| Boville Ernica | Commune | 8,773 | 8,873 | 8,811 | o |
| Broccostella | Commune | 2,396 | 2,646 | 2,807 | o |
| Campoli Appennino | Commune | 1,815 | 1,804 | 1,749 | o |
| Casalattico | Commune | 720 | 675 | 641 | o |
| Casalvieri | Commune | 3,216 | 3,211 | 2,867 | o |
| Cassino | Commune | 32,787 | 32,762 | 33,658 | o |
| Castelliri | Commune | 3,521 | 3,560 | 3,533 | o |
| Castelnuovo Parano | Commune | 845 | 876 | 902 | o |
| Castrocielo | Commune | 3,710 | 3,750 | 3,969 | o |
| Castro dei Volsci | Commune | 5,178 | 5,039 | 4,903 | o |
| Ceccano | Commune | 22,121 | 22,334 | 23,098 | o |
| Ceprano | Commune | 8,546 | 8,246 | 8,740 | o |
| Cervaro | Commune | 6,680 | 7,022 | 7,744 | o |
| Colfelice | Commune | 1,917 | 1,853 | 1,853 | o |
| Collepardo | Commune | 867 | 928 | 975 | o |
| Colle San Magno | Commune | 895 | 819 | 744 | o |
| Coreno Ausonio | Commune | 1,876 | 1,738 | 1,671 | o |
| Esperia | Commune | 4,380 | 4,131 | 3,903 | o |
| Falvaterra | Commune | 587 | 630 | 567 | o |
| Ferentino | Commune | 19,149 | 20,103 | 20,966 | o |
| Filettino | Commune | 614 | 550 | 551 | o |
| Fiuggi | Commune | 8,265 | 8,763 | 9,645 | o |
| Fontana Liri | Commune | 3,303 | 3,215 | 2,993 | o |
| Fontechiari | Commune | 1,287 | 1,288 | 1,318 | o |
| Frosinone | Commune | 45,815 | 48,636 | 46,649 | o |
| Fumone | Commune | 2,093 | 2,153 | 2,180 | o |
| Gallinaro | Commune | 1,159 | 1,221 | 1,246 | o |
| Giuliano di Roma | Commune | 2,239 | 2,228 | 2,343 | o |
| Guarcino | Commune | 1,691 | 1,662 | 1,658 | o |
| Isola del Liri | Commune | 12,794 | 12,191 | 11,963 | o |
| Monte San Giovanni Campano | Commune | 12,727 | 12,739 | 12,882 | o |
| Morolo | Commune | 2,994 | 3,090 | 3,267 | o |
| Paliano | Commune | 7,372 | 7,663 | 8,146 | o |
| Pastena | Commune | 1,715 | 1,672 | 1,528 | o |
| Patrica | Commune | 2,738 | 2,915 | 3,084 | o |
| Pescosolido | Commune | 1,473 | 1,568 | 1,552 | o |
| Picinisco | Commune | 1,261 | 1,206 | 1,255 | o |
| Pico | Commune | 3,194 | 3,123 | 3,004 | o |
| Piedimonte San Germano | Commune | 4,668 | 4,481 | 6,036 | o |
| Piglio | Commune | 4,734 | 4,700 | 4,657 | o |
| Pignataro Interamna | Commune | 2,473 | 2,447 | 2,558 | o |
| Pofi | Commune | 4,496 | 4,463 | 4,303 | o |
| Pontecorvo | Commune | 13,064 | 13,280 | 13,223 | o |
| Posta Fibreno | Commune | 1,365 | 1,274 | 1,217 | o |
| Ripi | Commune | 5,333 | 5,282 | 5,346 | o |
| Rocca d'Arce | Commune | 1,059 | 1,031 | 971 | o |
| Roccasecca | Commune | 7,327 | 7,442 | 7,536 | o |
| San Biagio Saracinisco | Commune | 438 | 365 | 361 | o |
| San Donato Val di Comino | Commune | 2,316 | 2,192 | 2,122 | o |
| San Giorgio a Liri | Commune | 3,092 | 3,067 | 3,166 | o |
| San Giovanni Incarico | Commune | 3,642 | 3,587 | 3,410 | o |
| Sant'Ambrogio sul Garigliano | Commune | 1,025 | 984 | 994 | o |
| Sant'Andrea del Garigliano | Commune | 1,705 | 1,589 | 1,566 | o |
| Sant'Apollinare | Commune | 2,038 | 1,950 | 1,931 | o |
| Sant'Elia Fiumerapido | Commune | 6,152 | 6,326 | 6,227 | o |
| Santopadre | Commune | 1,751 | 1,649 | 1,410 | o |
| San Vittore del Lazio | Commune | 2,442 | 2,674 | 2,679 | o |
| Serrone | Commune | 2,887 | 2,943 | 3,069 | o |
| Settefrati | Commune | 874 | 855 | 792 | o |
| Sgurgola | Commune | 2,463 | 2,556 | 2,623 | o |
| Sora | Commune | 26,089 | 26,029 | 26,247 | o |
| Strangolagalli | Commune | 2,536 | 2,503 | 2,501 | o |
| Supino | Commune | 4,749 | 4,783 | 4,893 | o |
| Terelle | Commune | 706 | 603 | 460 | o |
| Torre Cajetani | Commune | 1,216 | 1,279 | 1,388 | o |
| Torrice | Commune | 4,370 | 4,356 | 4,608 | o |
| Trevi nel Lazio | Commune | 1,951 | 1,822 | 1,853 | o |
| Trivigliano | Commune | 1,349 | 1,430 | 1,693 | o |
| Vallecorsa | Commune | 3,489 | 3,115 | 2,800 | o |
| Vallemaio | Commune | 1,137 | 1,052 | 1,002 | o |
| Vallerotonda | Commune | 2,072 | 1,854 | 1,671 | o |
| Veroli | Commune | 19,229 | 19,818 | 20,763 | o |
| Vicalvi | Commune | 766 | 801 | 806 | o |
| Vico nel Lazio | Commune | 2,024 | 2,161 | 2,256 | o |
| Villa Latina | Commune | 1,354 | 1,247 | 1,286 | o |
| Villa Santa Lucia | Commune | 2,386 | 2,622 | 2,639 | o |
| Villa Santo Stefano | Commune | 1,731 | 1,763 | 1,707 | o |
| Viticuso | Commune | 483 | 428 | 372 | o |
Source: Istituto Nazionale di Statistica Italia (web).
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