The Area Codes of Costa Rica: A C G L S U The 10 most frequently searched cities / regions or area codes: City/Town or RegionArea code 1.Alajuela24 (+506 24) 2.Cartago, San Jose, Heredia25 (+506 25) 3.Guanacaste, Central, North Puntarenas26 (+506 26) 4.Limon, South Puntarenas27 (+506 27) 5.San Jose, Heredia22 (+506 22) 6.Universidad de Costa Rica2511 (+506 2511)