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Welcome to Mercer County ...

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

The community of Aledo is the Seat for Mercer County.

Mercer County was founded in 1825 and was created by taking area from Schuyler County.

From the Census Estimates for 2019, <1> Mercer had a population of 15,437 people. This is a decrease of 5.92% since the last Census (which gave a population of 16,409 people in 2010).

At the time of the 2010 Census, Mercer represented 0.13% of the total population of Illinois.

Below are some of the communities located in Mercer County:

  • Aledo
    (Less than 2 miles to the west)
    • Aledo is located in Mercer County (IL)
    • Jump to our Gazetteer entry for Aledo
    • Population from the 2020 Census: 3,383 people
    • Jump to TripAdvisor's Tourism page for Aledo <2>
  • Alexis
    (13 miles [20.9 km] to the southeast)
    • Alexis is located in Mercer County (IL)
    • Jump to our Gazetteer entry for Alexis
    • Population from the 2020 Census: 778 people
    • Jump to TripAdvisor's Tourism page for Alexis <2>
  • Joy
    (7 miles [11.3 km] to the west)
    • Joy is located in Mercer County (IL)
    • Jump to our Gazetteer entry for Joy
    • Population from the 2020 Census: 377 people
    • Jump to TripAdvisor's Tourism page for Joy <2>
  • Keithsburg
    (12 miles [19.3 km] to the southwest)
  • Matherville
    (7 miles [11.3 km] to the northeast)
  • New Boston
    (14 miles [22.5 km] to the west)
  • North Henderson
    (15 miles [24.1 km] to the southeast)
  • Seaton
    (7 miles [11.3 km] to the southwest)
    • Seaton is located in Mercer County (IL)
    • Jump to our Gazetteer entry for Seaton
    • Population from the 2020 Census: 198 people
    • Jump to TripAdvisor's Tourism page for Seaton <2>
  • Sherrard
    (14 miles [22.5 km] to the northeast)
  • Viola
    (7 miles [11.3 km] to the east)
    • Viola is located in Mercer County (IL)
    • Jump to our Gazetteer entry for Viola
    • Population from the 2020 Census: 874 people
    • Jump to TripAdvisor's Tourism page for Viola <2>
  • Windsor
    (14 miles [22.5 km] to the east)
    • Windsor is located in Mercer County (IL)
    • Jump to our Gazetteer entry for Windsor
    • Population from the 2020 Census: 760 people

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.