Jefferson County (standard abbreviation: JF) is a county located in the state of Kansas. As of 2000, the population is 18,426. Its county seat is Oskaloosa, Kansas6.
Geography
According to the U.S. Census Bureau, the county has a total area of 1,442 km˛ (557 mi˛). 1,389 km˛ (536 mi˛) of it is land and 54 km˛ (21 mi˛)
of it is water. The total area is 3.74% water.
Adjacent counties
See also: List of counties in Kansas
Demographics
As of the census2 of 2000, there are 18,426 people, 6,830 households, and 5,190
families residing in the county. The population density is 13/km˛ (34/mi˛). There are 7,491
housing units at an average density of 5/km˛ (14/mi˛). The racial makeup of the
county is 96.70% White, 0.37% Black or African American, 0.92% Native American, 0.17% Asian, 0.01% Pacific Islander, 0.42% from other races, and 1.41% from two or more races. 1.28% of the population are Hispanic or Latino of any race.
There are 6,830 households out of which 35.70% have children under the age
of 18 living with them, 65.20% are married couples living together, 7.00% have a female householder
with no husband present, and 24.00% are non-families. 20.10% of all households
are made up of individuals and 9.30% have someone living alone who is 65 years
of age or older. The average household size is 2.66 and the average family size
is 3.07.
In the county the population is spread out with 27.40% under the age of 18,
7.00% from 18 to 24, 28.00% from 25 to 44, 24.90% from 45 to 64, and 12.80% who
are 65 years of age or older. The median age is 38 years. For every 100 females
there are 102.60 males. For every 100 females age 18 and over, there are 98.90
males.
The median income for a household in the county is $45,535, and the median
income for a family is $50,557. Males have a median income of $36,174 versus
$25,468 for females. The per capita income for the county is $19,373. 6.70% of the
population and 5.30% of families are below the poverty line. Out of the total population, 6.90% of those
under the age of 18 and 7.70% of those 65 and older are living below the
poverty line.
