| County: | Rio Arriba County |
| State: | New Mexico |
| Seal: | Rio Arriba County NM seal.jpg |
| Founded Year: | 1852 |
| Seat Wl: | Tierra Amarilla |
| Largest City Wl: | Española |
| Area Total Sq Mi: | 5896 |
| Area Land Sq Mi: | 5861 |
| Area Water Sq Mi: | 35 |
| Area Percentage: | 0.6% |
| Census Yr: | 2020 |
| Pop: | 40363 |
| Density Sq Mi: | auto |
| Web: | www.rio-arriba.org |
| Ex Image: | Rio Arriba CCH.jpg |
| Ex Image Cap: | Rio Arriba County Courthouse, Isaac Rapp, architect, 1916-17 |
| District: | 3rd |
| Time Zone: | Mountain |
| Named For: | location on the upper Rio Grande (río arriba means "upriver" in Spanish) |
| Leader Name: | Jeremy G. Maestas |
| Leader Title: | County Manager |
Rio Arriba County (Spanish; Castilian: Condado de Río Arriba|link=) is a county in the U.S. state of New Mexico. As of the 2020 census, the population was 40,363.[1] Its county seat is Tierra Amarilla.[2] 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.[3] 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.
The Battle of Embudo Pass took place in the southern part of the county during the Mexican–American War in January 1847.
According to the U.S. Census Bureau, the county has a total area of, of which are land and (0.6%) are water.[4] It is the fifth-largest county in New Mexico by area. The highest point in the county is the summit of Truchas Peak at .
The county acquired its present proportions after the creation of San Juan County and other adjustments.[5]
As of the 2000 census,[6] there were 41,190 people, 15,044 households, and 10,816 families living in the county. The population density was 7/mi2. There were 18,016 housing units at an average density of 3adj=preNaNadj=pre. The racial makeup of the county was 56.62% White, 0.35% Black or African American, 13.88% Native American, 0.14% Asian, 0.11% Pacific Islander, 25.62% from other races, and 3.28% from two or more races. 72.89% of the population were Hispanic or Latino of any race.
There were 15,044 households, out of which 36.90% had children under the age of 18 living with them, 48.80% were married couples living together, 15.90% had a female householder with no husband present, and 28.10% were non-families. 23.50% of all households were made up of individuals, and 7.80% had someone living alone who was 65 years of age or older. The average household size was 2.71 and the average family size was 3.19.
In the county, the population was spread out, with 28.60% under the age of 18, 8.90% from 18 to 24, 28.80% from 25 to 44, 22.90% from 45 to 64, and 10.90% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 98.00 males. For every 100 females age 18 and over, there were 97.70 males.
The median income for a household in the county was $29,429, and the median income for a family was $32,901. Males had a median income of $26,897 versus $22,223 for females. The per capita income for the county was $14,263. About 16.60% of families and 20.30% of the population were below the poverty line, including 23.30% of those under age 18 and 22.90% of those age 65 or over.
As of the 2010 census, there were 40,246 people, 15,768 households, and 10,477 families living in the county.[7] The population density was . There were 19,638 housing units at an average density of 3.4/mi2.[8] The racial makeup of the county was 51.6% white, 16.0% American Indian, 0.5% black or African American, 0.4% Asian, 28.0% from other races, and 3.3% from two or more races. Those of Hispanic or Latino origin made up 71.3% of the population.[7]
The largest ancestry groups were:[9]
Of the 15,768 households, 33.6% had children under the age of 18 living with them, 42.3% were married couples living together, 16.0% had a female householder with no husband present, 33.6% were non-families, and 28.2% of all households were made up of individuals. The average household size was 2.53 and the average family size was 3.09. The median age was 39.0 years.[7]
The median income for a household in the county was $41,437 and the median income for a family was $47,840. Males had a median income of $39,757 versus $31,657 for females. The per capita income for the county was $19,913. About 15.7% of families and 19.7% of the population were below the poverty line, including 20.6% of those under age 18 and 18.3% of those age 65 or over.[10]
From New Mexico's statehood to the early 1930s Rio Arriba was a traditional Republican county. The county became a Democratic stronghold from the 1930s onwards. The last Republican presidential candidate to carry the county was Dwight D. Eisenhower in 1956.[11] No Republican candidate for governor has won the county since at least 1966.[12]
It is located in New Mexico's 3rd congressional district, which has a Cook Partisan Voting Index rating of D+7 and is represented by Democrat Teresa Leger Fernandez. In the New Mexico legislature it is represented by Representatives Christine Chandler (District 43), Susan Herrera (District 41), Derrick Lente (District 65), Joseph Sanchez (District 40), Senator Leo Jaramillo (District 5), and Benny Shendo, Jr. (District 22).[13]
Current commissioners are:
| District | Name | Party | First elected | Term ends |
|---|---|---|---|---|
| District 1 | Brandon M. Bustos | Democratic | 2023 | 2026 |
| District 2 | Alex M. Naranjo | Democratic | 2023 | 2026 |
| District 3 | Moises A. Morales, Jr. | Democratic | 2024 | 2027 |
Rio Arriba County has six public school districts.[14]
Española Public Schools is the largest school district.
Additionally, there is a Bureau of Indian Education (BIE)-affiliated tribal elementary school,[15] Kha'p'o Community School, in Santa Clara Pueblo (the school's postal address states "Espanola").[16]