Guadalupe County, New Mexico  Guadalupe County () is a county in the U.S. state of New Mexico. As of the 2010 census, the population was 4,687, making it the fifth-least populous county in New Mexico. Its county seat is Santa Rosa. Guadalupe County was named after "Nuestra Señora de Guadalupe" (Our Lady of Guadalupe) or after the "Mesita de Guadalupe" (Guadalupe Plain). The county was created from the southern portion of San Miguel County February 26, 1891 by an act of the New Mexico Territorial Legislature. The original county seat was Puerto De Luna, but was moved north to Santa Rosa in 1903. That same year, after the popular Spanish–American War of 1898, the county's name was changed to Leonard Wood County after the Presidential physician, Major-General in the Rough Riders, and winner of the Medal of Honor. The name was later changed back to Guadalupe County. The County contains whole, or parts of, several previous Spanish land grants to include the Aqua Negra, the Jose Perea, the Anton Chico, and the Preston Beck land grants. According to the U.S. Census Bureau, the county has a total area of , of which is land and (0.04%) is water. As of the 2000 census, there were 4,680 people, 1,655 households, and 1,145 families living in the county. The population density was 2 people per square mile (1/km²). There were 2,160 housing units at an average density of 1 per square mile (0/km²). The racial makeup of the county was 54.06% White, 1.32% Black or African American, 1.13% Native American, 0.53% Asian, 0.04% Pacific Islander, 39.06% from other races, and 3.85% from two or more races. 81.22% of the population were Hispanic or Latino of any race. There were 1,655 households out of which 33.80% had children under the age of 18 living with them, 49.50% were married couples living together, 14.30% had a female householder with no husband present, and 30.80% were non-families. 27.90% of all households were made up of individuals and 11.50% had someone living alone who was 65 years of age or older. The average household size was 2.51 and the average family size was 3.05.