County · Illinois

Washington County, Illinois

Washington County, Illinois. Washington County had 13,564 residents in 2025 by the Census Bureau's estimate, down 1.5% since 2020, a steeper fall than Illinois's (−0.8%). It holds 30 places (14 cities, villages and boroughs and 16 towns and townships) and 4 census tracts. GEOID 17189.

Residents, July 2025 estimate

13,564

Census Bureau estimate (no margin published)
2020 Census count: 13,761 · ACS 2020-2024: 13,627

Median household income

$78,224

±$6,305 (90% margin)
Illinois: $83,390

Median home value

$155,700

±$7,507 (90% margin)
Illinois: $263,300

Median gross rent

$818

±$68 (90% margin)
Illinois: $1,274

How many people live in Washington County, and is it growing?

The 2020 Census counted 13,761 residents in Washington County. The Census Bureau estimates 13,564 for July 1, 2025, down 1.5% since 2020, a steeper fall than Illinois's (−0.8%). The 2020-2024 American Community Survey puts the population at 13,627 over 563 square miles of land.

July 2020→2021 −75 (13,654)
2021→2022 −3 (13,651)
2022→2023 −77 (13,574)
2023→2024 +5 (13,579)
2024→2025 −15 (13,564)

Washington County in Illinois. Boundaries: Census Bureau 2024.

Counts, ACS 2020-2024 5-year estimates, with the change from 2015-2019
Measure	Washington County	Illinois	Change since 2015-2019
Total population	13,627	12,694,798	−431
Households	5,795±149	5,036,449	−225
Average household size	2.31±0.06	2.46	no clear change
Housing units	6,415±49	5,457,452	−236

Washington County's population since 2000

From 15,148 in 2000 to 13,564 in 2025: down 10.5%. 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.

2000 Census 15,148
2005 (estimate) 14,950
2010 Census 14,716
2015 (estimate) 14,259
2020 Census 13,761
2025 (estimate) 13,564

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 Washington County?

Washington County holds 30 places: 14 cities, villages and boroughs (incorporated places) and 16 towns and townships (county subdivisions with their own government). The largest is Nashville Township with 3,395 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.

Places in Washington County, ACS 2020-2024 5-year estimates. Ring: estimate with a coefficient of variation over 40%.

Nashville Township	township	3,488	3,433±18	$63,029	$155,100	6.5%	100%
Nashville	city	3,105	2,940±130	$63,170	$156,500	6.8%	100%
Okawville Township	township	1,960	1,959±267	$84,792	$164,400	7.4%	100%
Okawville	village	1,369	1,299±248	$84,417	$160,700	3.5%	100%
Irvington Township	township	1,181	1,250±163	$72,115	$100,800	5.5%	100%
Hoyleton Township	township	1,035	1,305±255	$100,000	$127,500	7.0%	100%
Ashley Township	township	761	751±176	$73,125	$117,500	20.2%	100%
Du Bois Township	township	643	434±109	$66,250	$131,900	7.6%	100%
Irvington	village	581	774±145	$80,219	$91,700	4.7%	100%
Beaucoup TownshipGEOID 1718904442	township	581	668±175	$128,063	$190,000	7.2%	100%
Oakdale Township	township	561	842±199	$74,491	$134,800	3.7%	100%
Lively Grove TownshipGEOID 1718944108	township	550	561±160	not published	$236,400	26.6%	100%
Pilot Knob TownshipGEOID 1718959858	township	541	416±188	$86,071	$304,100	3.8%	100%
Hoyleton	village	520	523±106	$71,094	$100,000	15.1%	100%
Johannisburg TownshipGEOID 1718938453	township	500	391±133	$91,964	$209,400	0.0%	100%
Ashley	city	462	412±148	$49,559	$82,500	34.3%	100%
Plum Hill Township	township	456	388±112	$101,167	$175,000	2.8%	100%
Venedy TownshipGEOID 1718977434	township	406	391±132	$113,125	$205,000	1.0%	100%
Bolo TownshipGEOID 1718907172	township	392	260±128	$97,643	$120,000	0.0%	100%
Covington TownshipGEOID 1718917042	township	388	319±94	$65,000	$219,700	12.2%	100%
Richview TownshipGEOID 1718963732	township	318	259±71	$69,886	$95,700	6.2%	100%
AddievilleGEOID 1700230	village	259	294±87	$99,583	$156,000	7.8%	100%
RichviewGEOID 1763719	village	238	208±68	$71,250	$90,800	7.7%	100%
OakdaleGEOID 1754586	village	199	264±122	$106,364	$98,300	4.9%	100%
RadomGEOID 1762523	village	183	146±42	$55,833	$105,400	7.5%	100%
New MindenGEOID 1752714	village	175	218±66	$66,875	$95,000	8.5%	100%
Du BoisGEOID 1720890	village	175	122±44	$53,750	$75,000	9.0%	100%
VenedyGEOID 1777408	village	121	161±68	$86,250	$126,300	2.5%	100%
Wamac	city	985	804±194	$36,500	$20,100	27.7%	12%
Centralia	city	12,182	11,856±176	$47,807	$89,600	24.3%	0%

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 Washington County?

The median resident of Washington County is 44.2 years old; 20.8% are under 18 and 21.6% are 65 or older. The largest group is non-Hispanic white residents at 94.8%, then non-Hispanic residents of two or more races at 2.0%. 0.6% of residents were born outside the United States.

Age, origin and education, ACS 2020-2024 5-year estimates. Race groups are non-Hispanic; Hispanic includes any race.
Measure	Washington County	Illinois	Change since 2015-2019
Median age	44.2±0.5	39.0	no clear change
Under 18 years	20.8%	21.8%	–
65 years and over	21.6%±0.2 pts	17.0%	–
Hispanic or Latino (any race)	1.6%	18.8%	+0.2 pts
White alone, not Hispanic	94.8%±0.4 pts	58.1%	−1.2 pts
Black or African American alone, not Hispanic	1.2%±0.4 pts	13.3%	no clear change
Asian alone, not Hispanic	0.2%±0.2 pts	5.9%	–
American Indian and Alaska Native alone, not Hispanic	0.1%±0.1 pts	0.1%	–
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0.0%±0.3 pts	0.0%	–
Two or more races, not Hispanic	2.0%±0.5 pts	3.4%	–
Some other race alone, not Hispanic	0.1%±0.1 pts	0.4%	–
Born outside the United States	0.6%±0.3 pts	14.7%	no clear change
Speak a language other than English at home (age 5+)	2.0%±0.6 pts	24.0%	–
Civilian veterans (age 18+)	9.2%±1.2 pts	4.8%	–
With a disability	13.7%±1.4 pts	12.1%	–
No health insurance coverage	3.4%±0.7 pts	6.9%	no clear change
High school graduate or higher (age 25+)	92.9%±1.4 pts	90.5%	–
Bachelor's degree or higher (age 25+)	23.5%±2.0 pts	37.8%	no clear change
Graduate or professional degree (age 25+)	8.3%±1.4 pts	15.3%	–
Moved from another state in the past year	0.4%±0.2 pts	1.6%	–

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 Washington County earn?

Half of Washington County's 5,795 households earn less than $78,224 a year (±$6,305), against $83,390 in Illinois. In 2015-2019 it was $76,011 in 2024 dollars; the margins of error cannot tell the two periods apart. 7.5% of residents live below the poverty line.

Income and poverty in 2024 dollars, ACS 2020-2024 5-year estimates
Measure	Washington County	Illinois	Change since 2015-2019
Median household income	$78,224±$6,305	$83,390	no clear change
Mean household income	$93,788±$5,401	$115,638	–
Per capita income	$40,841±$2,339	$46,406	no clear change
People below the poverty line	7.5%±1.8 pts	11.8%	no clear change
Children under 18 below the poverty line	8.5%±4.7 pts	15.1%	no clear change
Households receiving SNAP	9.5%±2.0 pts	13.8%	–
Households with a broadband subscription	87.4%±2.0 pts	90.8%	–

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 Washington County?

Owners occupy 84.1% of Washington County's occupied homes and renters 15.9%. The median owner-occupied home is valued at $155,700 by its owner (±$7,507). The median renter pays $818 a month including utilities, and 22.5% of renters pay 35% or more of their income on rent.

Housing, ACS 2020-2024 5-year estimates
Measure	Washington County	Illinois	Change since 2015-2019
Median home value (owner-occupied)	$155,700±$7,507	$263,300	+$16,016
Median gross rent	$818±$68	$1,274	no clear change
Renters paying 35% or more of income on rent	22.5%±7.8 pts	39.0%	no clear change
Median monthly owner costs, with a mortgage	$1,391±$72	$1,987	–
Owner-occupied homes	84.1%±2.5 pts	67.1%	+6.6 pts
Housing units	6,415±49	5,457,452	−236
Homeowner vacancy rate	0.9%±0.8 pts	1.0%	–
Rental vacancy rate	0.2%±0.3 pts	5.0%	–
Single-family detached homes	87.2%±2.1 pts	58.2%	–
Mobile homes	8.9%±1.9 pts	2.3%	–
Built 2020 or later	1.7%±0.9 pts	0.7%	–
Built 1939 or earlier	20.2%±2.3 pts	20.2%	–

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 Washington County building?

Builders took permits for 15 new housing units across Washington County in 2025 (15 single-family), 1.1 per 1,000 residents.

2019 12 units
2020 22 units
2021 28 units
2022 22 units
2023 25 units
2024 18 units
2025 15 units

Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey

How do people in Washington County get to work?

83.7% of Washington County's workers drive alone and 7.4% work from home. The average trip to work takes 26.7 minutes. The unemployment rate in 2020-2024 averaged 4.3%.

Work and commuting, ACS 2020-2024 5-year estimates
Measure	Washington County	Illinois	Change since 2015-2019
In the labor force (age 16+)	63.3%±1.9 pts	65.0%	–
Unemployment rate	4.3%±1.3 pts	5.8%	no clear change
Drove alone to work	83.7%±2.6 pts	65.9%	–
Carpooled	5.5%±1.5 pts	7.8%	–
Public transportation	0.2%±0.2 pts	5.8%	–
Walked	2.0%±0.8 pts	2.8%	–
Worked from home	7.4%±1.8 pts	15.9%	+3.5 pts
Mean travel time to work	26.7 min±1.9	27.8 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 Washington County's census tracts?

Washington County is divided into 4 census tracts. Among those with a reliable estimate, median household income runs from $63,207 (Tract 9503) to $91,000 (Tract 9502).

Census tracts of Washington County, ACS 2020-2024 5-year estimates; sort by any column

Tract 950117189950100	Irvington (11%)	3,082	3,289±236	$80,147	$121,400	$850	6.6%
Tract 950217189950200	Okawville (23%)	3,684	3,547±267	$91,000	$165,600	$749	4.6%
Tract 950317189950300	Nashville (83%)	3,077	2,904±155	$63,207	$153,100	$823	7.2%
Tract 950417189950400	Ashley (10%)	3,918	3,887±267	$84,020	$173,100	$768	11.2%

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov

How does Washington County compare with Illinois's other counties?

Washington County's rank among Illinois's counties with a reliable estimate (1 = highest)
Measure	Rank
Population	76th of 102
Growth 2020-2025	34th of 102
Residents per square mile	84th of 102
Median household income	20th of 102
Median home value	35th of 102
Median gross rent	48th of 102
Poverty rate	92nd of 102
Bachelor's degree or higher	37th of 102
Median age	26th of 102

Every county in Illinois

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 Washington 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.