Country code: +506
Official White Pages of Costa Rica from RACSA (subsidiary of the telecommunications company ICE). You have to type in a first and last name; not just a last name on its own and you have the choice of searching throughout the whole country (Todo el País) or regionally in the following areas: San José, Alajuela, Heredia, Cartago, Puntarenas, Guanacaste, Limón and Avanzada.
Official Yellow Pages from RACSA. In Spanish. Type in what or who you're looking for in the Qué / Quién box and where they're located if you know Dónde and then click Buscar.
Yellow Pages for Costa Rica. In Spanish. Search by business name (Negocio), ranking (Clasificación) or keyword (Palabra Clave) - click buscar to search.
Another Yellow Pages directory for Costa Rica. Clear results and good autocomplete options. In Spanish. Type in what you're looking for (Qué Busca) and where (Dónde) - leave blank if searching all of Costa Rica. Click on encontrar to search.
English language business and services directory - separated into the different areas from Jaco to Puerto Jimenez.