18; 5.1% were between the ages of 18 and 24; 19.3% were from 25 to 44; 31.4% were from 45 to 64; and 22.6% were 65 years of age or older. The gender makeup of the city was 51.6% male and 48.4% female. 2000 census As of the census of 2000, there were 566 people, 261 households, and 149 families residing in the city. The population density was . There were 353 housing units at an average density of . The racial makeup of the city was 98.59% White, 0.35% Native American, 0.71% from other races, and 0.35% from two or more races. Hispanic or Latino of any race were 2.30% of the population. There were 261 households, out of which 23.4% had children under the age of 18 living with them, 48.7% were married couples living together, 5.7% had a female householder with no husband present, and 42.9% were non-families. 39.5% of all households were made up of individuals, and 21.1% had someone living alone who was 65 years of age or older. The average household size was 2.13 and the average family size was 2.86. In the city, the population was spread out, with 22.4% under the age of 18, 4.6% from 18 to 24, 23.9% from 25 to 44, 27.7% from 45 to 64, and 21.4% who were 65 years of age or older. The median age was 44 years. For every 100 females, there were 95.8 males. For every 100 females age 18 and over, there were 96.9 males. The median income for a household in the city was $23,807, and the median income for a family was $31,667. Males had a median income of $38,750 versus $20,357 for females. The per capita income for the city was $14,237. About 13.0% of families and 18.4% of the population were below the poverty line, including 19.5% of those under age 18 and 19.8% of those age 65 or over. 1983 earthquake On Friday, October 28, 1983, the Borah Peak earthquake occurred at 8:06 am MDT, measured at 6.9 on the moment magnitude scale. The Challis-Mackay region experienced rather thorough damage, with 11 commercial buildings and 39 homes with major damage; while another 200 houses were damaged, minor to moderately. Chickens were running all through the streets. Mackay experienced the most severe damage. Most of the city's large buildings on its Main Street were damaged, to some extent;