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Welcome to Rio Arriba County ...Time Zone: Rio Arriba County lies in the Mountain Time Zone (MST/MDT) and observes daylight saving time. The community of Tierra Amarilla is the Seat for Rio Arriba County. Rio Arriba County is one of the original counties of New Mexico and was founded in 1852. From the Census Estimates for 2019, <1> Rio Arriba had a population of 38,921 people. This is a decrease of 3.39% since the last Census (which gave a population of 40,286 people in 2010). At the time of the 2010 Census, Rio Arriba represented 1.96% of the total population of New Mexico. Websites of Interest ...
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This page was last modified/updated: 15 Jul 2025