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Where am ILOCATED

Randolph County, Illinois

Randolph County, Illinois, has 29,921 residents (July 2025 estimate). Its county seat is Chester. It uses Central Time and covers 575 sq mi (1,490 km²) of land.

ChicagoAurora
Randolph County in Illinois
Ste. Genevieve CountyChesterSpartaRed BudSteeleville
Randolph County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
29,921
Land area
575 sq mi (1,490 km²)
County seat or government
Chester
Time zone
Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income
$68,131 ± $3,611
Median home value
$135,100 ± $10,002
Median rent, with utilities
$780 ± $28
Homes lived in by their owners
76.6% ± 1.8 points
County type
County
Metro or micro area
Outside any metro or micro areaNext to: Carbondale, IL micro area and St. Louis, MO-IL metro area
Water area
21.7 sq mi (56.2 km²)
State
Illinois
County code (FIPS)
17157
Coordinates (central point)
38.056515, -89.821210
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 Randolph 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. 622338,326 people
  2. 622786,281 people
  3. 622865,491 people
  4. 622882,820 people
  5. 622372,367 people
  6. 636732,340 people
  7. 622572,046 people
  8. 629072,013 people
  9. 622421,660 people
  10. 622721,521 people
  11. 62277940 people
  12. 62916925 people
All 18
  1. 62241879 people
  2. 62217767 people
  3. 62292762 people
  4. 62280421 people
  5. 62297158 people
  6. 6226180 people

18 ZIP Code areas overlap Randolph 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

Randolph County government website ↗ is the next stop for county offices, tax, voting, jury and records information. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Precincts in Randolph County, largest first

  1. Chester Precinct7,627 people
  2. Sparta Precinct4,995 people
  3. Red Bud Precinct4,844 people
  4. Steeleville Precinct2,510 people
  5. Percy Precinct1,297 people
  6. Evansville Precinct1,174 people
  7. Coulterville Precinct1,170 people
  8. Tilden Precinct1,017 people
  9. Ruma Precinct820 people
  10. Ellis Grove Precinct816 people
  11. Baldwin Precinct723 people
  12. Prairie du Rocher Precinct722 people
All 20
  1. Bremen Precinct497 people
  2. Wine Hill Precinct437 people
  3. Palestine Precinct410 people
  4. Walsh Precinct390 people
  5. Central Precinct203 people
  6. Brewerville Precinct177 people
  7. Rockwood Precinct176 people
  8. Kaskaskia Precinct53 people

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

School districts in Randolph County, largest first

  1. Chester Community Unit School District 1399,136 people
  2. Sparta Community Unit School District 1408,194 people
  3. Red Bud Community Unit School District 1327,095 people
  4. Trico Community Unit School District 1765,969 people
  5. Steeleville Community Unit School District 1382,850 people
  6. Coulterville Unit School District 11,287 people
  7. Chester Non-High School District 122716 people
  8. Prairie du Rocher Community Consolidated School District 134716 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. Chester, Illinois (city)6,797 people
  2. Sparta, Illinois (city)4,068 people
  3. Red Bud, Illinois (city)3,782 people
  4. Steeleville, Illinois (village)1,855 people
  5. Percy, Illinois (village)921 people
  6. Coulterville, Illinois (village)796 people
  7. Evansville, Illinois (village)781 people
  8. Tilden, Illinois (village)762 people
  9. Prairie du Rocher, Illinois (village)454 people
  10. Ruma, Illinois (village)394 people
  11. Ellis Grove, Illinois (village)359 people
  12. Baldwin, Illinois (village)355 people
All 14
  1. Kaskaskia, Illinois (village)38 people
  2. Rockwood, Illinois (village)14 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Ste. Genevieve County, Missouri22 mi southwest
  2. Perry County, Missouri24 mi south
  3. Perry County, Illinois25 mi east
  4. Monroe County, Illinois25 mi northwest
  5. St. Clair County, Illinois29 mi north
  6. Washington County, Illinois30 mi northeast
  7. Jackson County, Illinois30 mi southeast

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.