San Isidro is a canton located within the Heredia province of Costa Rica, situated in the highlands northeast of the provincial capital city. It serves as an administrative division defined by its distinct geographical boundaries and local governance structure. The area covers a total surface of 26.96 square kilometers, with a mean elevation reaching 1,337 meters above sea level. This positioning places it firmly within the central highland region, contributing to its unique topographical character and environmental setting.

The canton was officially established on 13 July 1905 through the issuance of decree 40. This legislative action marked the formal creation of San Isidro as a distinct political entity within the broader Heredia province. Since its founding, the area has maintained its status as a recognized canton, preserving its administrative independence while remaining integrated into the regional framework of Costa Rica's provincial system.

Administratively, the canton is subdivided into four specific districts: San Isidro, San José, Concepción, and San Francisco. The head city is located within the San Isidro district, serving as the primary focal point for local administration. Geographically, the Pará Blanca River forms the far northeastern border of the canton, providing a natural boundary that helps define the extent of the territory and influences the local landscape.

While specific cultural festivals or architectural landmarks are not detailed in the available records, the canton's character is defined by its highland location and riverine borders. The presence of multiple districts suggests a distributed community structure rather than a single concentrated urban center. The natural features, particularly the elevation and the bordering river, likely play a significant role in shaping the daily life and environmental context for residents across the different districts.

According to verified data, the population of San Isidro was recorded at 22,806 as of 2022. Earlier demographic records from the 2011 census indicated a population of 20,633 inhabitants, showing growth over that decade. Transportation within the canton is facilitated by road routes that connect the various districts and link the area to the broader provincial network, ensuring accessibility for residents and visitors alike.