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Where am ILOCATED

Washington County, Illinois

Washington County, Illinois, has 13,564 residents (July 2025 estimate). Its county seat is Nashville. It uses Central Time and covers 563 sq mi (1,457 km²) of land.

ChicagoAurora
Washington County in Illinois
NashvilleOkawvilleWamacIrvington
Washington County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
13,564
Land area
563 sq mi (1,457 km²)
County seat or government
Nashville
Time zone
Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income
$78,224 ± $6,305
Median home value
$155,700 ± $7,507
Median rent, with utilities
$818 ± $68
Homes lived in by their owners
84.1% ± 2.3 points
County type
County
Metro or micro area
Outside any metro or micro areaNext to: Centralia, IL micro area, Mount Vernon, IL micro area, and St. Louis, MO-IL metro area
Water area
1.31 sq mi (3.39 km²)
State
Illinois
County code (FIPS)
17189
Coordinates (central point)
38.353140, -89.417187
Open this point in the location finder

These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.

Time zones in Washington County

Time zoneLocal time and UTC offsetNext clock change
Central TimeAmerica/ChicagoUTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock.Enable JavaScript for upcoming changes.

Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.

ZIP Code areas, largest first

  1. 6280119,827 people
  2. 622634,819 people
  3. 622372,367 people
  4. 622572,046 people
  5. 622711,873 people
  6. 628081,602 people
  7. 628031,132 people
  8. 622141,048 people
  9. 62268764 people
  10. 62848738 people
  11. 62877437 people
  12. 62831339 people
All 13
  1. 62876146 people

13 ZIP Code areas overlap Washington County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.

Official county information

We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Townships in Washington County, largest first

  1. Nashville Township3,433 people
  2. Okawville Township1,959 people
  3. Hoyleton Township1,305 people
  4. Irvington Township1,250 people
  5. Oakdale Township842 people
  6. Ashley Township751 people
  7. Beaucoup Township668 people
  8. Lively Grove Township561 people
  9. Du Bois Township434 people
  10. Pilot Knob Township416 people
  11. Johannisburg Township391 people
  12. Venedy Township391 people
All 16
  1. Plum Hill Township388 people
  2. Covington Township319 people
  3. Bolo Township260 people
  4. Richview Township259 people

People counts are American Community Survey 2020–2024 5-year estimates. All townships in Illinois, by county

School districts in Washington County, largest first

  1. Centralia High School District 20019,500 people
  2. Freeburg Community High School District 7713,462 people
  3. Pinckneyville Community High School District 10110,597 people
  4. Nashville Community High School District 998,431 people
  5. Nashville Consolidated Community School District 496,301 people
  6. Pinckneyville School District 505,762 people
  7. West Washington County Community Unit District 103,748 people
  8. Marissa Community Unit School District 402,354 people
  9. Ashley Community Consolidated School District 151,672 people
  10. Willow Grove School District 461,463 people
  11. Irvington County Community Unit School District 11966 people
  12. Oakdale Community Consolidated School District 1829 people
All 14
  1. St. Libory Consolidated School District 30802 people
  2. North Wamac School District 186573 people

Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.

Cities, towns and communities, largest first

These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.

  1. Centralia, Illinois (city)11,856 people
  2. Nashville, Illinois (city)2,940 people
  3. Okawville, Illinois (village)1,299 people
  4. Wamac, Illinois (city)804 people
  5. Irvington, Illinois (village)774 people
  6. Hoyleton, Illinois (village)523 people
  7. Ashley, Illinois (city)412 people
  8. Addieville, Illinois (village)294 people
  9. Oakdale, Illinois (village)264 people
  10. New Minden, Illinois (village)218 people
  11. Richview, Illinois (village)208 people
  12. Venedy, Illinois (village)161 people
All 14
  1. Radom, Illinois (village)146 people
  2. Du Bois, Illinois (village)122 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Clinton County, Illinois17 mi north
  2. Perry County, Illinois19 mi south
  3. Jefferson County, Illinois27 mi east
  4. St. Clair County, Illinois29 mi west
  5. Randolph County, Illinois30 mi southwest
  6. Marion County, Illinois34 mi northeast

Before using this answer on a form

Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.

Find the county where you are now, check its ZIP area, or check the time zone where you are.

See this county on Census.gov ↗

Areas that only touch the edge

These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.