According to the 2011 census, Tres Ríos had a population of 9,331 inhabitants.[3] The district has an area of 2.19 km2[4] and an elevation of 1,345 metres.[1]
Significant colonial settlement of the region did not take place until the 18th century when priests from the Church of the Holy Spirit of Esparza settled in the area. The priests had been traveling with indigenous peoples from the Salamanca region towards Cartago and stopped in what was then known as the Valley of Three Rivers (Spanish: Valle de los Tres Ríos). The priests built a small chapel which they dedicated to the Our Lady of the Pillar, whose image had been given to them by Bishop Heredia. Their presence in the area attracted permanent settlement and a stable population, and the fledgling town became known as Nuestra Señora del Pilar de los Tres Ríos (English: Our Lady of the Pillar of the Three Rivers).
Infrastructure
Education
Tres Ríos has one school, the Escuela Central de Tres Ríos.
The district is covered by the passenger Interurbano Line operated by Incofer. There is an unmanned platform stop in the north of the district at Plaza Barcelona shopping center.
Economy
The agricultural area surrounding Tres Ríos is one of the eight recognized coffee production areas in the country. The regional coffee flavor is associated with high fertility soil that is enriched by minerals from eruptions of the Irazú Volcano. The volcano last erupted in 1963. This flavor is balanced by moisture from the rain and warm summers.[7][8]
Due to dynamic urban growth in the metropolitan area of Costa Rica in the late twentieth century, the land use has progressively changed from agricultural to suburban development. The expansion of urban areas has force the closure of dozens of coffee farms. However, regions within La Unión, including Tres Ríos, Concepción and San Ramón, continue to grow coffee beans for the gourmet market.
The economy of Tres Ríos has become increasingly diversified and is no longer solely dependent on coffee production. Because of the region's location between the cities of San José and Cortago, the economy has become linked to their outward development and now caters towards trade and development. Urban development has also led to the foundation of several private schools.[7]
