The Town of Arriba is a Statutory Town located in Lincoln County, Colorado, United States. The population was 244 at the 2000 census.
According to the United States Census Bureau, the town has a total area of 0.5 square miles (1.2 km²), all of it land.
There were 106 households out of which 26.4% had children under the age of 18 living with them, 48.1% were married couples living together, 6.6% had a female householder with no husband present, and 40.6% were non-families. 34.0% of all households were made up of individuals and 17.9% had someone living alone who was 65 years of age or older. The average household size was 2.30 and the average family size was 3.05.
In the town the population was spread out with 25.8% under the age of 18, 6.1% from 18 to 24, 26.2% from 25 to 44, 23.4% from 45 to 64, and 18.4% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 96.8 males. For every 100 females age 18 and over, there were 96.7 males.
The median income for a household in the town was $25,000, and the median income for a family was $27,500. Males had a median income of $27,188 versus $19,000 for females. The per capita income for the town was $13,370. About 8.1% of families and 13.5% of the population were below the poverty line, including 3.0% of those under the age of eighteen and 19.6% of those sixty five or over.