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Jefferson County

county in Illinois, United States
AdministrativeArea County Of Illinois Q486440
Jefferson County
Nyttend · Public Domain · Wikimedia

Facts

19 properties

Identity

Instance of
county of Illinois
Inception
1819[12]
Official website
jeffersoncounty.illinois.gov[13]
Native label
Jefferson County[22]

Location

Country
United States[2]
Coordinate location
🗺️ 38.300°, -88.920°
Located in the administrative territorial entity
Illinois[1]
Shares border with
Marion County, Franklin County, Wayne County, Hamilton County, Washington County, Perry County[4][5][6][7][8][9]

Population and size

Area
+1512[24]
Population
37k (37k–39k, n=7)[14][15][16][17][18][19][20]
More facts +9
Capital
Mount Vernon[3]
Contains the administrative territorial entity
Mount Vernon[11]
Geoshape
🗺️ View shape: United States/Illinois/Jefferson County
NCI Thesaurus ID
C108323[23]
Named after
Thomas Jefferson[10]
Number of households
+14792[21]
P14687
Data:US presidential elections by county/Jefferson County, Illinois.tab[27]
Per capita income
+26742[26]
Water as percent of area
+2.2[25]
🏷️ Also known as
en Jefferson County, IL en Jefferson County, Illinois en Jefferson County ar مقاطعه جيفيرسون، إلينوي ar مقاطعة جيفيرسون el κομητεία Τζέφερσον es condado de Jefferson es Jefferson County fa شهرستان جفرسون fi Jeffersonin piirikunta fr comté de Jefferson fr Jefferson County he מחוז ג'פרסון hu Jefferson megye it contea di Jefferson it Jefferson County ja ジェファスン・カウンティ ja ジェファースン・カウンティ ja ジェファースン郡 ja ジェファーソン・カウンティ
🔖 Identifiers · 26
VIAF cluster ID
148939263
Library of Congress Authorities ID
n81149946
ArchINFORM location ID
18908
FIPS 6-4 ID
17081
Freebase ID
/m/0nvhp
GADM ID
USA.14.41_1
GNIS Feature ID
424242
GeoNames ID
4241773
Getty Thesaurus of Geographic Names ID
1002514
HASC
US.IL.JF
INaturalist place ID
1809
J9U entity ID
987007550562905171
Show all 26 identifiers +14
KnowWhereGraph entity ID
administrativeRegion.USA.17081
OBO Gazetteer ID
00186214
OpenHistoricalMap relation ID
2791695
OpenStreetMap relation ID
1801530
Our Campaigns container ID
968
Quora topic ID
Jefferson-County-IL
Taxonomicon ID
1805320
Topic's main category
Category:Jefferson County, Illinois
U.S. National Archives Identifier
10036468
UMLS CUI
C3816477
Who's on First ID
102083513
Wolfram Language entity code
Entity["AdministrativeDivision", {"JeffersonCounty", "Illinois", "UnitedStates"}]
WorldCat Entities ID
E39PBJvXdTWTBpcphPbmkJkJjC
Yale LUX ID
place/80cfc994-873c-4849-9500-7ab312c259d7
📚 Sources · 1
  • GeoNames as of 2026-09-26 · 2 statements · CC BY 4.0 CC BY 4.0 — attribution: GeoNames (www.geonames.org), licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Values as shipped.

Report an error or request removal Lineage (PROV-JSON)

⛏️ Lake Facts · open-dataset statements via 4ort-mint

From open datasets, joined by identifier and shown only for properties Wikidata does not state on this entity — except where the dataset is the registry authority for the fact (ClinicalTrials.gov on trial registration data): there its value is shown instead, with Wikidata's noted beside it. Every row carries its dataset edition and licence.

Elevation above sea levelP2044
147 m 2026-09-26 A/ADM2 · US GeoNames (CC BY 4.0) as of 2026-09-26
where from?
Source
GeoNames
Edition
20260926 · as of 2026-09-26
Licence
CC BY 4.0
Credit
CC BY 4.0 — attribution: GeoNames (www.geonames.org), licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Values as shipped.
Bronze
1da92a6323a5fec3… admin1CodesASCII.txt +9 files
Transform
4ort-mint · lake · version not recorded
Located in time zoneP421
America/Chicago 2026-09-26 A/ADM2 · US GeoNames (CC BY 4.0) as of 2026-09-26
where from?
Source
GeoNames
Edition
20260926 · as of 2026-09-26
Licence
CC BY 4.0
Credit
CC BY 4.0 — attribution: GeoNames (www.geonames.org), licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Values as shipped.
Bronze
1da92a6323a5fec3… admin1CodesASCII.txt +9 files
Transform
4ort-mint · lake · version not recorded
CC BY 4.0 — attribution: GeoNames (www.geonames.org), licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Values as shipped.
🔗 Connections
Contained subdivisions 25
Centralia, Mount Vernon, Nason, Dix, Woodlawn, Belle Rive, Waltonville, Ina +17 more
Shares border with 6
Franklin County, Marion County, Washington County, Hamilton County, Wayne County, Perry County
← Shares border with 6
Franklin County, Marion County, Washington County, Hamilton County, Wayne County, Perry County
← Category combines topics 3
Category:People from Jefferson County, Illinois, Category:Geography of Jefferson County, Illinois, Category:Populated places in Jefferson County, Illinois
Capital 1
Mount Vernon
Contains the administrative territorial entity 1
Mount Vernon
Country 1
United States
Located in the administrative territorial entity 1
Illinois
Named after 1
Thomas Jefferson
People born here 1
Sarah E. Farro
Topic's main category 1
Category:Jefferson County, Illinois
← Capital of 1
Mount Vernon
← Category's main topic 1
Category:Jefferson County, Illinois
← Contains the administrative territorial entity 1
Illinois
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Related Entities

Illinois Thomas Jefferson United States

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] ↑ . jeffersoncounty.illinois.gov. jeffersoncounty.illinois.gov. Provenance: wikidata.org.
  2. [3] ↑ . jeffersoncounty.illinois.gov. jeffersoncounty.illinois.gov. Provenance: wikidata.org.
  3. [4] ↑ . wikidata.org.
  4. [5] ↑ . wikidata.org.
  5. [6] ↑ . wikidata.org.
  6. [7] ↑ . wikidata.org.
  7. [8] ↑ . wikidata.org.
  8. [9] ↑ . wikidata.org.
  9. [1] ↑ . jeffersoncounty.illinois.gov. jeffersoncounty.illinois.gov. Provenance: wikidata.org.
  10. [10] ↑ . jeffersoncounty.illinois.gov. jeffersoncounty.illinois.gov. Provenance: wikidata.org.
  11. [11] ↑ . wikidata.org.
  12. [12] ↑ . jeffersoncounty.illinois.gov. jeffersoncounty.illinois.gov. Provenance: wikidata.org.
  13. [13] ↑ . Retrieved . wikidata.org.
  14. [14] ↑ . 2010 United States Census. Retrieved . census.gov. Provenance: wikidata.org.
  15. [15] ↑ . census.gov. census.gov. Provenance: wikidata.org.
  16. [16] ↑ . census.gov. census.gov. Provenance: wikidata.org.
  17. [17] ↑ . census.gov. census.gov. Provenance: wikidata.org.
  18. [18] ↑ . census.gov. census.gov. Provenance: wikidata.org.
  19. [19] ↑ . Population Estimates Program. census.gov. Provenance: wikidata.org.
  20. [20] ↑ . 2020 United States Census. Retrieved . data.census.gov. Provenance: wikidata.org.
  21. [21] ↑ . 2016–2020 American Community Survey. Retrieved . data.census.gov. Provenance: wikidata.org.
  22. [22] ↑ . jeffersoncounty.illinois.gov. jeffersoncounty.illinois.gov. Provenance: wikidata.org.
  23. [23] ↑ . wikidata.org.
  24. [24] ↑ . wikidata.org.
  25. [25] ↑ . wikidata.org.
  26. [26] ↑ . 2016–2020 American Community Survey. Retrieved . data.census.gov. Provenance: wikidata.org.
  27. [27] ↑ . wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). Jefferson County. Retrieved November 8, 2026, from https://4ort.xyz/entity/jefferson-county-q486440
MLA “Jefferson County.” 4ort.xyz Knowledge Graph, 4ort.xyz, 8 Nov. 2026, https://4ort.xyz/entity/jefferson-county-q486440.
BibTeX @misc{4ortxyz_jefferson-county-q486440_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Jefferson County}}, year = {2026}, url = {https://4ort.xyz/entity/jefferson-county-q486440}, note = {Accessed: 2026-11-08}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Jefferson County — https://4ort.xyz/entity/jefferson-county-q486440 (retrieved 2026-11-08)

Canonical URL: https://4ort.xyz/entity/jefferson-county-q486440 · Last refreshed:

Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 10d ago · Schekinov Alexey Victorovich · 2026-10-30 view diff on Wikidata ↗
    "Changed claim: Image: Jefferson County Courthouse in Mount Vernon.jpg"
  2. 10d ago · Schekinov Alexey Victorovich · 2026-10-29 view diff on Wikidata ↗
    "Changed claim: Inception: 1819"
  3. 10d ago · Schekinov Alexey Victorovich · 2026-10-29 view diff on Wikidata ↗
    "Changed claim: Instance of: county of Illinois"
  4. 10d ago · Schekinov Alexey Victorovich · 2026-10-29 view diff on Wikidata ↗
    "Changed claim: Capital: Mount Vernon"
  5. 10d ago · Schekinov Alexey Victorovich · 2026-10-29 view diff on Wikidata ↗
    "Changed claim: Inception: 1819"
  6. 10d ago · Schekinov Alexey Victorovich · 2026-10-29 view diff on Wikidata ↗
    "Changed claim: Instance of: county of Illinois"
  7. 9w ago · Theklan · 2026-09-04 view diff on Wikidata ↗
    Tabular data series → Data:US presidential elections by county/Jefferson County, I
    "Created claim: Tabular data series: Data:US presidential elections by county/Jefferson County, Illinois.tab, Link US presidential election dataset (P14687, subject: United States preside"
  8. 25w ago · Mahir256 · 2026-05-13 view diff on Wikidata ↗
    OBO Gazetteer ID → 00186214
    Taxonomicon ID → 1805320
    UMLS CUI → C3816477
    "Changed the item: QuickStatements 3.0 batch #31546"
  9. 25w ago · Mahir256 · 2026-05-13 view diff on Wikidata ↗
    Number of households → {'amount': '+14792'}
    Topic's main category → Category:Jefferson County, Illinois
    Coordinate location → {'lat': 38.3, 'lon': -88.92}
    Category for people born here → Category:Births in Jefferson County, Illinois
    + 16 other properties edited (see Wikidata diff for full list)
    "Created claim: NCI Thesaurus ID: C108323, #quickstatements; #temporary_batch_1778695477825"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.