| Most Populous Provinces | ||
| Department | Province | Population |
| Lima | Lima | 8,617,314 |
| Prov. Const. del Callao | Prov. Const. del Callao | 982,800 |
| Arequipa | Arequipa | 947,384 |
| La Libertad | Trujillo | 928,388 |
| Lambayeque | Chiclayo | 843,445 |
| Piura | Piura | 744,659 |
| Loreto | Maynas | 554,705 |
| Junín | Huancayo | 499,432 |
| Cusco | Cusco | 435,114 |
| Ancash | Santa | 430,925 |
| Cajamarca | Cajamarca | 375,227 |
| Ucayali | Coronel Portillo | 370,098 |
| Ica | Ica | 353,611 |
| Piura | Sullana | 312,307 |
| Tacna | Tacna | 307,608 |
| Huánuco | Huánuco | 304,487 |
| Lambayeque | Lambayeque | 291,006 |
| Puno | San Román | 282,043 |
| Ayacucho | Huamanga | 266,390 |
| Junín | Satipo | 254,488 |
| Puno | Puno | 245,925 |
| Lima | Cañete | 226,260 |
| Lima | Huaura | 215,138 |
| Ica | Chincha | 212,643 |
| Cajamarca | Jaen | 198,661 |
| Junín | Chanchamayo | 196,791 |
| Lima | Huaral | 185,076 |
| San Martin | San Martín | 181,946 |
| Cusco | La Convención | 179,670 |
| Cajamarca | Chota | 166,757 |
| Apurímac | Andahuaylas | 165,165 |
| Ancash | Huaraz | 162,889 |
| Tumbes | Tumbes | 161,257 |