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Welcome to Jefferson County ...

Time Zone: Jefferson County lies in the Central Time Zone (CST/CDT) and observes daylight saving time.

The community of Mount Vernon is the Seat for Jefferson County.

Jefferson County was founded in 1819. Jefferson was created by taking area from Edwards and White Counties.

From the Census Estimates for 2019, <1> Jefferson had a population of 37,684 people. This is a decrease of 2.76% since the last Census (which gave a population of 38,755 people in 2010).

At the time of the 2010 Census, Jefferson represented 0.3% of the total population of Illinois.

Below are some of the communities located in Jefferson County:

  • Belle Rive
    (10 miles [16.1 km] to the southeast)
  • Bluford
    (9 miles [14.5 km] to the east)
    • Bluford is located in Jefferson County (IL)
    • Jump to our Gazetteer entry for Bluford
    • Population from the 2020 Census: 660 people
    • Jump to TripAdvisor's Tourism page for Bluford <2>
  • Bonnie
    (7 miles [11.3 km] to the south)
    • Bonnie is located in Jefferson County (IL)
    • Jump to our Gazetteer entry for Bonnie
    • Population from the 2020 Census: 380 people
    • Jump to TripAdvisor's Tourism page for Bonnie <2>
  • Dix
    (9 miles [14.5 km] to the north)
    • Dix is located in Jefferson County (IL)
    • Jump to our Gazetteer entry for Dix
    • Population from the 2020 Census: 428 people
    • Jump to TripAdvisor's Tourism page for Dix <2>
  • Ina
    (11 miles [17.7 km] to the south)
    • Ina is located in Jefferson County (IL)
    • Jump to our Gazetteer entry for Ina
    • Population from the 2020 Census: 2,279 people
    • Jump to TripAdvisor's Tourism page for Ina <2>
  • Mount Vernon
    (Less than 2 miles to the northeast)
  • Nason
    (9 miles [14.5 km] to the south)
    • Nason is located in Jefferson County (IL)
    • Jump to our Gazetteer entry for Nason
    • Population from the 2020 Census: 228 people
    • Jump to TripAdvisor's Tourism page for Nason <2>
  • Waltonville
    (9 miles [14.5 km] to the southwest)
  • Woodlawn
    (6 miles [9.7 km] to the west)
    • Woodlawn is located in Jefferson County (IL)
    • Jump to our Gazetteer entry for Woodlawn
    • Population from the 2020 Census: 670 people
    • Jump to TripAdvisor's Tourism page for Woodlawn <2>

Websites of Interest ...

Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2010 Census and the next count will be for the 2020 Census.
<2>While we're fans and frequent users of TripAdvisor, you should know that we're also members of the TripAdvisor affiliate program.