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Where am ILOCATED

Marion County, Illinois

Marion County, Illinois, has 36,382 residents (July 2025 estimate). Its county seat is Salem. It uses Central Time and covers 573 sq mi (1,483 km²) of land.

ChicagoAurora
Marion County in Illinois
CentraliaSalemCentral CitySandoval
Marion County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
36,382
Land area
573 sq mi (1,483 km²)
County seat or government
Salem
Time zone
Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income
$61,240 ± $3,240
Median home value
$103,000 ± $5,381
Median rent, with utilities
$794 ± $40
Homes lived in by their owners
74.7% ± 2.0 points
County type
County
Metro or micro area
Centralia, IL micro areaCentral county
Water area
3.56 sq mi (9.23 km²)
State
Illinois
County code (FIPS)
17121
Coordinates (central point)
38.648236, -88.920362
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 Marion 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. 6288111,078 people
  3. 628702,281 people
  4. 628822,057 people
  5. 628491,887 people
  6. 628541,827 people
  7. 628301,416 people
  8. 628381,341 people
  9. 628891,066 people
  10. 628751,039 people
  11. 62853969 people
  12. 62893926 people
All 15
  1. 62807767 people
  2. 62851371 people
  3. 62892150 people

15 ZIP Code areas overlap Marion 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 Marion County, largest first

  1. Centralia Township14,039 people
  2. Salem Township8,914 people
  3. Sandoval Township1,898 people
  4. Odin Township1,764 people
  5. Raccoon Township1,509 people
  6. Tonti Township1,320 people
  7. Kinmundy Township1,113 people
  8. Stevenson Township1,036 people
  9. Iuka Township938 people
  10. Haines Township864 people
  11. Alma Township793 people
  12. Patoka Township737 people
All 17
  1. Carrigan Township558 people
  2. Romine Township420 people
  3. Foster Township390 people
  4. Omega Township369 people
  5. Meacham Township338 people

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

School districts in Marion County, largest first

  1. Centralia High School District 20019,500 people
  2. Salem Community High School District 60014,607 people
  3. Centralia School District 13512,655 people
  4. Salem School District 1118,653 people
  5. Flora Community Unit School District 357,569 people
  6. South Central Community Unit School District 4014,031 people
  7. Raccoon Consolidated School District 12,398 people
  8. Sandoval Community Unit School District 5012,392 people
  9. Central City School District 1332,146 people
  10. Selmaville Community Consolidated School District 101,958 people
  11. Odin Public School District 7221,750 people
  12. Iuka Community Consolidated School District 71,687 people
All 15
  1. Patoka Community Unit School District 1001,220 people
  2. Kell Consolidated School District 2895 people
  3. Farrington Community Consolidated School District 99833 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. Salem, Illinois (city)7,236 people
  3. Central City, Illinois (village)1,081 people
  4. Sandoval, Illinois (village)1,004 people
  5. Odin, Illinois (village)972 people
  6. Wamac, Illinois (city)804 people
  7. Kinmundy, Illinois (city)803 people
  8. Junction City, Illinois (village)638 people
  9. Farina, Illinois (village)570 people
  10. Iuka, Illinois (village)534 people
  11. Patoka, Illinois (village)498 people
  12. Alma, Illinois (village)285 people
All 15
  1. Kell, Illinois (village)145 people
  2. Walnut Hill, Illinois (village)127 people
  3. Vernon, Illinois (village)69 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Jefferson County, Illinois24 mi south
  2. Clay County, Illinois25 mi east
  3. Fayette County, Illinois25 mi north
  4. Clinton County, Illinois27 mi west
  5. Wayne County, Illinois30 mi southeast
  6. Washington County, Illinois34 mi southwest

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.