San Mateo is a canton in the Alajuela province of Costa Rica.

[2] The northern border of the elongated province is formed by the Jesús María, Machuca, Agua Agría, Calera rivers and Quebrada Zapote.

The Quebrada Concepción, Grande de Tárcoles and the Machuca rivers establish the southern border.

Cerro La Lana is a landmark that delineates a northeast tip of the canton.

[7] The canton is covered by the following road routes: This Costa Rican location article is a stub.