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Jefferson County, Iowa facts for kids

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Jefferson County
Courthouse in Fairfield is on the NRHP
Courthouse in Fairfield is on the NRHP
Map of Iowa highlighting Jefferson County
Location within the U.S. state of Iowa
Map of the United States highlighting Iowa
Iowa's location within the U.S.
Country  United States
State  Iowa
Founded 1839
Named for Thomas Jefferson
Seat Fairfield
Largest city Fairfield
Area
 • Total 437 sq mi (1,130 km2)
 • Land 436 sq mi (1,130 km2)
 • Water 1.4 sq mi (4 km2)  0.3%%
Population
 (2010)
 • Total 16,843
 • Density 39/sq mi (15/km2)
Time zone UTC−6 (Central)
 • Summer (DST) UTC−5 (CDT)
Congressional district 2nd
Website County website

Jefferson County is a county located in the U.S. state of Iowa. As of the 2010 census, the population was 16,843. The county seat is Fairfield. The county was formed on January 21, 1839 and named after President Thomas Jefferson.

Jefferson County comprises the Fairfield, IA Micropolitan Statistical Area.

Geography

According to the U.S. Census Bureau, the county has a total area of 437 square miles (1,130 km2), of which 436 square miles (1,130 km2) is land and 1.4 square miles (3.6 km2) (0.3%) is water.

Major highways

Adjacent counties

Demographics

Historical population
Census Pop.
1850 9,904
1860 15,038 51.8%
1870 17,839 18.6%
1880 17,469 −2.1%
1890 15,184 −13.1%
1900 17,437 14.8%
1910 15,951 −8.5%
1920 16,440 3.1%
1930 16,241 −1.2%
1940 15,762 −2.9%
1950 15,696 −0.4%
1960 15,818 0.8%
1970 15,774 −0.3%
1980 16,316 3.4%
1990 16,310 0.0%
2000 16,181 −0.8%
2010 16,843 4.1%
Est. 2015 17,555 4.2%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2010-2013

2010 census

The 2010 census recorded a population of 16,843 in the county, with a population density of 38.6893/sq mi (14.9380/km2). There were 7,594 housing units, of which 6,846 were occupied.

2000 census

USA Jefferson County, Iowa age pyramid
2000 Census Age Pyramid for Jefferson County

As of the census of 2000, there were 16,181 people, 6,649 households, and 4,281 families residing in the county. The population density was 37 people per square mile (14/km²). There were 7,241 housing units at an average density of 17 per square mile (6/km²). The racial makeup of the county was 96.02% White, 0.64% Black or African American, 0.17% Native American, 1.70% Asian, 0.04% Pacific Islander, 0.53% from other races, and 0.91% from two or more races. 1.84% of the population were Hispanic or Latino of any race.

There were 6,649 households out of which 31.10% had children under the age of 18 living with them, 53.10% were married couples living together, 8.00% had a female householder with no husband present, and 35.60% were non-families. 30.40% of all households were made up of individuals and 10.70% 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 2.93.

In the county, the population was spread out with 24.40% under the age of 18, 7.60% from 18 to 24, 24.40% from 25 to 44, 29.80% from 45 to 64, and 13.80% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 95.90 males. For every 100 females age 18 and over, there were 93.60 males.

The median income for a household in the county was $33,851, and the median income for a family was $43,819. Males had a median income of $32,066 versus $22,479 for females. The per capita income for the county was $19,579. About 7.40% of families and 10.90% of the population were below the poverty line, including 12.40% of those under age 18 and 9.00% of those age 65 or over.

Communities

Fairfield Business Park, Fairfield IA
Fairfield Business Park built north of Fairfield, in 1998.

Population ranking

The population ranking of the following table is based on the 2010 census of Jefferson County.

county seat

Rank City/Town/etc. Municipal type Population (2010 Census)
1 Fairfield City 9,464
2 Batavia City 499
3 Libertyville City 315
4 Lockridge City 268
5 Maharishi Vedic City City 259
6 Packwood City 204
7 Pleasant Plain City 93
8 Coppock (mostly in Henry and Washington Counties) City 47
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