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Where am ILOCATED

Johnson County, Illinois

Johnson County, Illinois, has 13,363 residents (July 2025 estimate). Its county seat is Vienna. It uses Central Time and covers 344 sq mi (890 km²) of land.

ChicagoAurora
Johnson County in Illinois
Pope CountyViennaGorevilleBuncombeCypressNew Burnside
Johnson County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
13,363
Land area
344 sq mi (890 km²)
County seat or government
Vienna
Time zone
Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income
$62,528 ± $6,968
Median home value
$160,500 ± $11,366
Median rent, with utilities
$781 ± $163
Homes lived in by their owners
82% ± 3.3 points
County type
County
Metro or micro area
Outside any metro or micro areaNext to: Marion-Herrin, IL micro area and Paducah, KY-IL metro area
Water area
4.95 sq mi (12.8 km²)
State
Illinois
County code (FIPS)
17087
Coordinates (central point)
37.460709, -88.882131
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 Johnson 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. 629956,339 people
  2. 629392,958 people
  3. 629222,608 people
  4. 629121,515 people
  5. 629851,128 people
  6. 629721,056 people
  7. 62923441 people
  8. 62908440 people
  9. 62943428 people
  10. 62967309 people

10 ZIP Code areas overlap Johnson 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.

Precincts in Johnson County, largest first

  1. Grantsburg No. 1 Precinct2,058 people
  2. Goreville No. 1 Precinct1,635 people
  3. Vienna No. 2 Precinct1,047 people
  4. Elvira Precinct974 people
  5. Vienna No. 1 Precinct942 people
  6. Bloomfield Precinct859 people
  7. Simpson Precinct819 people
  8. Vienna No. 3 Precinct750 people
  9. Tunnel Hill Precinct727 people
  10. Lake No. 1 Precinct725 people
  11. Cache Precinct716 people
  12. Goreville No. 2 Precinct471 people
All 17
  1. Burnside Precinct406 people
  2. Ozark Precinct369 people
  3. Lake No. 2 Precinct357 people
  4. Belknap Precinct262 people
  5. Grantsburg No. 2 Precinct259 people

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

School districts in Johnson County, largest first

  1. Marion Community Unit School District 228,215 people
  2. Vienna High School District 1339,821 people
  3. Vienna School District 555,581 people
  4. Goreville Community Unit School District 13,717 people
  5. Century Community Unit School District 1002,119 people
  6. New Simpson Hill Consolidated District 322,037 people
  7. Cypress School District 641,256 people
  8. Buncombe Consolidated School District 43947 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. Vienna, Illinois (city)1,873 people
  2. Goreville, Illinois (village)1,236 people
  3. Buncombe, Illinois (village)329 people
  4. Cypress, Illinois (village)252 people
  5. New Burnside, Illinois (village)162 people
  6. Belknap, Illinois (village)115 people
  7. Simpson, Illinois (village)40 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Williamson County, Illinois19 mi north
  2. Pope County, Illinois19 mi east
  3. Massac County, Illinois19 mi southeast
  4. Union County, Illinois20 mi west
  5. Pulaski County, Illinois22 mi southwest
  6. Saline County, Illinois27 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.