Some Costa Rican vehicle registration plates, those for commercial passenger transport, have a code as the first one or two letters of the plate (followed by B for buses, or T for taxis) indicating the district of registration (followed here by their main towns as an aid to location):

• A - Alajuela (Alajuela)
• C - Cartago (Cartago)
• G - Guanacaste (Liberia)
• H - Heredia (Heredia)
• L - Limon (Puerto Limon)
• P - Puntarenas (Puntarenas)
• SJ - San José metropolitan area
• SM - San José servicios municipios