| Rio Arriba County New Mexico Cities/Towns - Alcade, Abiquiu, Chama, Chimayo, Coyote, Dulce, Espanola, San Juan, Santa Clara, Tierra Amarilla (County Seat), Tres Piedras |
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Your Ad Here Rio Arriba County is a county located in the U.S. state of New Mexico. As of 2000, the population was 41,190. Its county seat is Tierra Amarilla. History The county was one of nine originally created for the Territory of New Mexico in 1852. ![]() |