Lake Arthur is a town in Chaves County, New Mexico, United States. The population was 432 at the 2000 census. According to the United States Census Bureau, the town has a total area of 0.6 square miles (1.6 km2), all of it land. As of the census of 2000, there were 432 people, 134 households, and 107 families residing in the town. The population density was 789.2 people per square mile (303.3/km²). There were 149 housing units at an average density of 272.2 per square mile (104.6/km²). The racial makeup of the town was 62.96% White, 0.46% Native American, 0.69% Asian, 34.49% from other races, and 1.39% from two or more races. Hispanic or Latino of any race were 70.14% of the population.