Rio Arriba County (Spanish: Condado de Río Arriba) is a county in the U.S. state of New Mexico. As of the 2010 census, the population was 40,246. Its county seat is Tierra Amarilla. Its northern border is the Colorado state line. Rio Arriba County comprises the Española, NM Micropolitan Statistical Area, which is also included in the Albuquerque-Santa Fe-Las Vegas, NM Combined Statistical Area. The county was one of nine originally created for the Territory of New Mexico in 1852. Originally extending west to the California line, it included the site of present-day Las Vegas, Nevada. The county seat was initially sited at San Pedro de Chamita, and shortly afterwards at Los Luceros. In 1860 the seat was moved to Plaza del Alcalde. Since 1880 Tierra Amarilla has been the county seat. More information...
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