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Places · place_us_il_jefferson_county

Jefferson County

Jefferson County is a county of Illinois, United States.

Updated 2026-10-29 · rev 2

Overview

Jefferson County is a county of Illinois, United States (FIPS il081), with a population of about 38,827^[1].

Geography

Coordinates: 38.3005, -88.9240
Time zone: America/Chicago

Continue via relations

Relations page →

Located in Illinois^[1]
Contains places Belle Rive^[1]
Contains places Bluford^[1]
Contains places Bonnie^[1]
Contains places Dix^[1]
Contains places Ina^[1]
Contains places Mount Vernon^[1]
Contains places Nason^[1]
Contains places Opdyke^[1]
Contains places Waltonville^[1]
Contains places Woodlawn^[1]

Mentioned in

Places Belle Rive
Places Bluford
Places Bonnie
Places Dix
Places Ina
Places Mount Vernon
Places Nason
Places Opdyke
Places Waltonville
Places Woodlawn

Sources

GeoNames US dataset (US.txt / admin2Codes.txt) ↩ ↩