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County · code 17157

Randolph CountyIllinois

Randolph County is in Illinois and has its seat in Chester. The county was created on October 5, 1795.

  • Founded1795
  • County seatChester
  • Named forEdmund Randolph
  • Land area575 sq mi + 22 sq mi water
  • Population30,163 2020 Census
  • Parcels mapped26,113 checked 14 October 2026
Open the free map Click any parcel in Randolph County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

Perry, MOSte. Genevieve, MOMonroeSt. ClairPerryJackson Chester Census outline · seat marked

Where it is

Randolph on the map of Illinois

Illinois has 102 counties and county equivalents, each with its own records office. Shapes with a page are links.

Adams CountyAlexander CountyBond CountyBoone CountyBrown CountyBureau CountyCalhoun CountyCarroll CountyCass CountyChampaign CountyChristian CountyClark CountyClay CountyClinton CountyColes CountyCook CountyCrawford CountyCumberland CountyDeKalb CountyDe Witt CountyDouglas CountyDuPage CountyEdgar CountyEdwards CountyEffingham CountyFayette CountyFord CountyFranklin CountyFulton CountyGallatin CountyGreene CountyGrundy CountyHamilton CountyHancock CountyHardin CountyHenderson CountyHenry CountyIroquois CountyJackson CountyJasper CountyJefferson CountyJersey CountyJo Daviess CountyJohnson CountyKane CountyKankakee CountyKendall CountyKnox CountyLake CountyLaSalle CountyLawrence CountyLee CountyLivingston CountyLogan CountyMcDonough CountyMcHenry CountyMcLean CountyMacon CountyMacoupin CountyMadison CountyMarion CountyMarshall CountyMason CountyMassac CountyMenard CountyMercer CountyMonroe CountyMontgomery CountyMorgan CountyMoultrie CountyOgle CountyPeoria CountyPerry CountyPiatt CountyPike CountyPope CountyPulaski CountyPutnam CountyRichland CountyRock Island CountySt. Clair CountySaline CountySangamon CountySchuyler CountyScott CountyShelby CountyStark CountyStephenson CountyTazewell CountyUnion CountyVermilion CountyWabash CountyWarren CountyWashington CountyWayne CountyWhite CountyWhiteside CountyWill CountyWilliamson CountyWinnebago CountyWoodford CountyRandolph County Randolph
Counties of Illinois · Randolph highlighted

History

Formed in 1795 from St. Clair County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Randolph County was created by the Northwest Territory from St. Clair County. It was named after Edmund Randolph. The county went through several territorial transitions: it became part of Indiana Territory in 1800, then Illinois Territory in 1809, and finally became a county in the state of Illinois in 1818.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries; the 5 that matter most are shown first.

  1. 1795
    Randolph County created Randolph created by the Northwest Territory from St. Clair.
    from St. Clair
    · Terr. Papers U.S., 3:441
  2. 1800
    Became part of Illinois Randolph became a county in Indiana Territory when Indiana Territory was created from the Northwest Territory. · Terr. Papers U.S., 3:86-88; U.S. Stat., vol. 2, ch. 41 [1800]/pp. 58-59
  3. 1809
    Randolph County created Randolph became a part of Illinois Territory when Illinois Territory was created from Indiana Territory; Randolph continued de facto, with no new boundaries specified. · U.S. Stat., vol. 2, ch 13 [1809], sec. 1/pp. 514-515
  4. 1809
    Randolph County created Randolph created by Illinois Territory, effectively continuing the county of the same name created by the Northwest Territory in 1795. Randolph gained from St. Clair and gained the former area of Knox (Indiana) that became part of Illinois Territory; Randolph included a small area of present Indiana.
    from St. Clairfrom Knox (Ind.)
    · Ill. Terr. Recs., 3-4; Terr. Papers U.S., 17:620-621
  5. 1818
    Became part of Illinois Randolph became a county in the state of Illinois when Illinois was created from Illinois Territory. · Terr. Papers U.S., 10:803; U.S. Stat., vol. 3, ch. 67 [1818], secs. 1-2, 7/pp. 428-429, 431, and res. 1 [1818]/p. 536
Show all 13 changes (8 more)
  1. 1795
    Randolph County created Randolph created by the Northwest Territory from St. Clair.
    from St. Clair
    · Terr. Papers U.S., 3:441
  2. 1800
    Became part of Illinois Randolph became a county in Indiana Territory when Indiana Territory was created from the Northwest Territory. · Terr. Papers U.S., 3:86-88; U.S. Stat., vol. 2, ch. 41 [1800]/pp. 58-59
  3. 1801
    Gained territory Randolph gained from Knox (Indiana) and St. Clair.
    from Knox (Ind.)from St. Clair
    · Ind. Terr., Exec. Journal, 97-100; Pence and Armstrong, 212, 520
  4. 1803
    Exchanged territory Randolph exchanged with St. Clair.
    with St. Clair
    · Ind. Terr., Exec. Journal, 117-118
  5. 1809
    Randolph County created Randolph became a part of Illinois Territory when Illinois Territory was created from Indiana Territory; Randolph continued de facto, with no new boundaries specified. · U.S. Stat., vol. 2, ch 13 [1809], sec. 1/pp. 514-515
  6. 1809
    Randolph County created Randolph created by Illinois Territory, effectively continuing the county of the same name created by the Northwest Territory in 1795. Randolph gained from St. Clair and gained the former area of Knox (Indiana) that became part of Illinois Territory; Randolph included a small area of present Indiana.
    from St. Clairfrom Knox (Ind.)
    · Ill. Terr. Recs., 3-4; Terr. Papers U.S., 17:620-621
  7. 1812
    Lost territory Randolph lost to creation of Gallatin, Johnson, and Madison; Randolph eliminated from present Indiana.
    to Gallatinto Johnsonto Madison
    · Ill. Terr. Recs., 26; Terr. Papers U.S., 17:643
  8. 1813
    Exchanged territory Randolph exchanged with Gallatin and St. Clair.
    with Gallatinwith St. Clair
    · Ill. Terr. Laws, 120-121
  9. 1816
    Lost territory Randolph lost to creation of Jackson.
    to Jackson
    · Ill. Terr. Laws, 215-217; Ill. Laws 1822-1823, 122-123
  10. 1816
    Lost territory Randolph lost to creation of Monroe.
    to Monroe
    · Ill. Terr. Laws, 195-198
  11. 1818
    Became part of Illinois Randolph became a county in the state of Illinois when Illinois was created from Illinois Territory. · Terr. Papers U.S., 10:803; U.S. Stat., vol. 3, ch. 67 [1818], secs. 1-2, 7/pp. 428-429, 431, and res. 1 [1818]/p. 536
  12. 1827
    Lost territory Randolph lost to creation of Perry.
    to Perry
    · Ill. Rev. Code 1826-1827, pp. 110-113
  13. 1829
    Boundary clarified Boundary between Randolph and Monroe was clarified (no change).
    with Monroeno change
    · Ill. Rev. Code 1828-1829, pp. 31-32

Land and parcels

What the maps cover in Randolph

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Randolph by the Census

Population
30,163 2020 Census count
Housing units
13,373 2020 Census count
Land area
575 square miles
Water area
22 square miles
People per sq mi
52 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Randolph County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

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Questions

Common questions about Randolph County

When was Randolph County founded?
Randolph County was founded in 1795, formed from St. Clair County, and named after Edmund Randolph.
What is the county seat of Randolph County?
The county seat of Randolph County is Chester.
Is there an online parcel map for Randolph County?
Yes. A public source publishes a parcel map of 26,113 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Randolph County's boundary or name changed?
Randolph County was created in 1795 from St. Clair County. Since then the Atlas of Historical County Boundaries records 11 later changes, chiefly involving St. Clair County, Gallatin County and Knox (Ind.) County.
Is my lot in a flood zone?
We do not have flood maps for Randolph County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door