County · Iowa
Jefferson County, Iowa
Jefferson County, Iowa. Jefferson County had 15,291 residents in 2025 by the Census Bureau's estimate, down 2.4% since 2020, while Iowa grew 1.5%. It holds 8 places (8 cities, villages and boroughs) and 5 census tracts. GEOID 19101.
Residents, July 2025 estimate
15,291
Census Bureau estimate (no margin published)
2020 Census count: 15,663 · ACS 2020-2024: 15,705
Median household income
$61,620
±$10,446 (90% margin)
Iowa: $75,059
Median home value
$163,400
±$8,367 (90% margin)
Iowa: $208,000
Median gross rent
$883
±$67 (90% margin)
Iowa: $972
How many people live in Jefferson County, and is it growing?
The 2020 Census counted 15,663 residents in Jefferson County. The Census Bureau estimates 15,291 for July 1, 2025, down 2.4% since 2020, while Iowa grew 1.5%. The 2020-2024 American Community Survey puts the population at 15,705 over 436 square miles of land.
| Measure | Jefferson County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| Total population | 15,705 | 3,210,507 | −2,443 |
| Households | 6,952±224 | 1,315,707 | no clear change |
| Average household size | 2.11±0.07 | 2.36 | −0.43 |
| Housing units | 7,706±46 | 1,437,699 | no clear change |
Jefferson County's population since 2000
From 16,181 in 2000 to 15,291 in 2025: down 5.5%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov
What cities and towns are in Jefferson County?
Jefferson County holds 8 places: 8 cities, villages and boroughs (incorporated places). The largest is Fairfield with 9,220 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| Fairfield | 9,416 | $51,311 |
|---|---|---|
| Batavia | 430 | $56,250 |
| Maharishi Vedic City | 277 | $66,875 |
| Libertyville | 274 | $76,131 |
| LockridgeGEOID 1946065 | 244 | $113,750 |
| Packwood | 183 | $51,500 |
| Pleasant PlainGEOID 1963615 | 84 | $86,458 |
| CoppockGEOID 1916140 | 36 | not published |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov
Who lives in Jefferson County?
The median resident of Jefferson County is 43.7 years old; 17.1% are under 18 and 26.7% are 65 or older. The largest group is non-Hispanic white residents at 82.4%, then non-Hispanic Asian residents at 8.2%. 14.1% of residents were born outside the United States.
| Measure | Jefferson County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| Median age | 43.7±0.6 | 38.6 | no clear change |
| Under 18 years | 17.1%±1.5 pts | 22.9% | – |
| 65 years and over | 26.7%±0.4 pts | 18.1% | – |
| Hispanic or Latino (any race) | 4.1% | 7.3% | +1.1 pts |
| White alone, not Hispanic | 82.4%±0.6 pts | 82.3% | +1.9 pts |
| Black or African American alone, not Hispanic | 2.4%±0.3 pts | 3.8% | −4.7 pts |
| Asian alone, not Hispanic | 8.2%±0.4 pts | 2.5% | +3.8 pts |
| American Indian and Alaska Native alone, not Hispanic | 0.1%±0.1 pts | 0.2% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.2 pts | 0.2% | – |
| Two or more races, not Hispanic | 2.5%±0.7 pts | 3.5% | – |
| Some other race alone, not Hispanic | 0.3%±0.3 pts | 0.3% | – |
| Born outside the United States | 14.1%±1.5 pts | 5.9% | +4.8 pts |
| Speak a language other than English at home (age 5+) | 15.9%±1.7 pts | 9.1% | – |
| Civilian veterans (age 18+) | 7.7%±1.8 pts | 6.5% | – |
| With a disability | 13.4%±1.9 pts | 12.6% | – |
| No health insurance coverage | 6.7%±2.1 pts | 5.0% | no clear change |
| High school graduate or higher (age 25+) | 95.1%±1.3 pts | 93.3% | – |
| Bachelor's degree or higher (age 25+) | 43.2%±3.7 pts | 31.4% | +11.7 pts |
| Graduate or professional degree (age 25+) | 18.8%±2.7 pts | 10.5% | – |
| Moved from another state in the past year | 4.2%±1.2 pts | 2.2% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Jefferson County earn?
Half of Jefferson County's 6,952 households earn less than $61,620 a year (±$10,446), against $75,059 in Iowa. In 2015-2019 it was $58,714 in 2024 dollars; the margins of error cannot tell the two periods apart. 15.2% of residents live below the poverty line.
| Measure | Jefferson County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $61,620±$10,446 | $75,059 | no clear change |
| Mean household income | $82,383±$10,170 | $98,187 | – |
| Per capita income | $36,823±$4,353 | $40,877 | no clear change |
| People below the poverty line | 15.2%±3.5 pts | 11.1% | no clear change |
| Children under 18 below the poverty line | 12.7%±7.6 pts | 12.9% | no clear change |
| Households receiving SNAP | 12.9%±2.6 pts | 8.8% | – |
| Households with a broadband subscription | 88.4%±3.3 pts | 88.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Jefferson County?
Owners occupy 67.7% of Jefferson County's occupied homes and renters 32.3%. The median owner-occupied home is valued at $163,400 by its owner (±$8,367). The median renter pays $883 a month including utilities, and 45.8% of renters pay 35% or more of their income on rent.
| Measure | Jefferson County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $163,400±$8,367 | $208,000 | +$17,809 |
| Median gross rent | $883±$67 | $972 | no clear change |
| Renters paying 35% or more of income on rent | 45.8%±8.8 pts | 35.2% | no clear change |
| Median monthly owner costs, with a mortgage | $1,380±$104 | $1,533 | – |
| Owner-occupied homes | 67.7%±3.9 pts | 71.7% | no clear change |
| Housing units | 7,706±46 | 1,437,699 | no clear change |
| Homeowner vacancy rate | 0.5%±0.5 pts | 0.8% | – |
| Rental vacancy rate | 2.9%±3.7 pts | 5.7% | – |
| Single-family detached homes | 73.5%±3.7 pts | 72.2% | – |
| Mobile homes | 6.4%±2.5 pts | 3.2% | – |
| Built 2020 or later | 0.4%±0.4 pts | 1.7% | – |
| Built 1939 or earlier | 32.9%±3.7 pts | 23.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Jefferson County building?
Builders took permits for 2 new housing units across Jefferson County in 2025 (2 single-family), 0.1 per 1,000 residents.
Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Jefferson County get to work?
69.7% of Jefferson County's workers drive alone and 18.2% work from home. The average trip to work takes 15.9 minutes. The unemployment rate in 2020-2024 averaged 8.0%.
| Measure | Jefferson County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 59.0%±3.2 pts | 66.4% | – |
| Unemployment rate | 8.0%±3.6 pts | 3.6% | no clear change |
| Drove alone to work | 69.7%±4.3 pts | 76.0% | – |
| Carpooled | 4.3%±1.6 pts | 7.8% | – |
| Public transportation | 0.5%±0.4 pts | 0.7% | – |
| Walked | 4.4%±1.3 pts | 2.9% | – |
| Worked from home | 18.2%±3.7 pts | 11.3% | +7.9 pts |
| Mean travel time to work | 15.9 min±1.9 | 19.8 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What are Jefferson County's census tracts?
Jefferson County is divided into 5 census tracts. Among those with a reliable estimate, median household income runs from $50,896 (Tract 903.02) to $92,083 (Tract 901).
| Tract 90119101090100 | 2,748±331 | $92,083 |
|---|---|---|
| Tract 90219101090200 | 3,127±297 | $63,438 |
| Tract 903.0119101090301 | 2,084±400 | $51,667 |
| Tract 903.0219101090302 | 2,498±370 | $50,896 |
| Tract 90419101090400 | 5,248±492 | $57,237 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov
How does Jefferson County compare with Iowa's other counties?
| Measure | Rank |
|---|---|
| Population | 48th of 99 |
| Growth 2020-2025 | 76th of 99 |
| Residents per square mile | 32nd of 99 |
| Median household income | 91st of 99 |
| Median home value | 47th of 99 |
| Median gross rent | 26th of 99 |
| Poverty rate | 8th of 99 |
| Bachelor's degree or higher | 4th of 99 |
| Median age | 23rd of 99 |
Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Jefferson County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.