San Miguel does not have a tourist office. The city's Casa de la Cultura (15 Calle Poniente and 8 Av. Sur; tel. 503/2661-6582) provides basic information in Spanish.
Scotiabank and Banco Agricultura, which are 1 block from the square, have ATMs. ZonaWeb Ciber (2a Calle Poniente; tel. 503/2661-8661; daily 8am-5pm) is half a block south of the cathedral and offers Internet access for 75¢ per hour. The post office (tel. 503/2661-3709) is just off the square at 4 Av. Sur.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.