Chase County is part of the Emporia Micropolitan Statistical Area.
Chase County's population was estimated to be 3,070 in the year 2006, an increase of 37, or +1.2%, over the previous six years.
As of the U.S. Census in 2000, there were 3,030 people, 1,246 households, and 817 families residing in the county. The population density was 4 people per square mile (2/km²). There were 1,529 housing units at an average density of 2 per square mile (1/km²). The racial makeup of the county was 96.90% White, 1.02% Black or African American, 0.56% Native American, 0.13% Asian, 0.56% from other races, and 0.83% from two or more races. Hispanic or Latino of any race were 1.75% of the population.
There were 1,246 households out of which 28.30% had children under the age of 18 living with them, 54.60% were married couples living together, 7.60% had a female householder with no husband present, and 34.40% were non-families. 31.10% of all households were made up of individuals and 14.90% had someone living alone who was 65 years of age or older. The average household size was 2.34 and the average family size was 2.92.
In the county the population was spread out with 24.10% under the age of 18, 6.50% from 18 to 24, 26.60% from 25 to 44, 24.10% from 45 to 64, and 18.70% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 103.90 males. For every 100 females age 18 and over, there were 99.40 males.
The median income for a household in the county was $32,656, and the median income for a family was $39,848. Males had a median income of $27,402 versus $21,528 for females. The per capita income for the county was $17,422. About 4.10% of families and 8.60% of the population were below the poverty line, including 10.00% of those under age 18 and 6.30% of those age 65 or over.