Costarainera
| Costarainera A Costarainea | |
|---|---|
| Comune di Costarainera | |
| Saint Anthony Church | |
| Location of Costarainera | |
| Coordinates: 43°51′N 7°56′E / 43.850°N 7.933°E | |
| Country | Italy | 
| Region | Liguria | 
| Province | Province of Imperia (IM) | 
| Area | |
|  • Total | 2.4 km2 (0.9 sq mi) | 
| Population  (Dec. 2004) | |
|  • Total | 775 | 
| • Density | 320/km2 (840/sq mi) | 
| Time zone | UTC+1 (CET) | 
| • Summer (DST) | UTC+2 (CEST) | 
| Postal code | 18017 | 
| Dialing code | 0183 | 
Costarainera (Ligurian: A Costarainea) is a comune (municipality) in the Province of Imperia in the Italian region Liguria, located about 100 kilometres (62 mi) southwest of Genoa and about 9 kilometres (6 mi) southwest of Imperia. As of 31 December 2004, it had a population of 775 and an area of 2.4 square kilometres (0.93 sq mi).
Costarainera borders the following municipalities: Cipressa and San Lorenzo al Mare.