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Welcome to Monroe County ...

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

The community of Waterloo is the Seat for Monroe County.

Monroe County was founded in 1816. Monroe was created by taking area from Randolph and Saint Clair Counties.

From the Census Estimates for 2019, <1> Monroe had a population of 34,637 people. This is an increase of 4.98% since the last Census (which gave a population of 32,994 people in 2010).

At the time of the 2010 Census, Monroe represented 0.26% of the total population of Illinois.

Below are some of the communities located in Monroe County:

  • Columbia
    (9 miles [14.5 km] to the north)
    • Columbia is located in Monroe County (IL)
    • Jump to our Gazetteer entry for Columbia
    • Population from the 2020 Census: 10,627 people
    • Jump to TripAdvisor's Tourism page for Columbia <2>
  • Fults
    (11 miles [17.7 km] to the south)
    • Fults is located in Monroe County (IL)
    • Jump to our Gazetteer entry for Fults
    • Population from the 2020 Census: 28 people
    • Jump to TripAdvisor's Tourism page for Fults <2>
  • Hecker
    (9 miles [14.5 km] to the east)
    • Hecker is located in Monroe County (IL)
    • Jump to our Gazetteer entry for Hecker
    • Population from the 2020 Census: 474 people
    • Jump to TripAdvisor's Tourism page for Hecker <2>
  • Maeystown
    (7 miles [11.3 km] to the southwest)
  • Valmeyer
    (5 miles [8 km] to the west)
  • Waterloo
    (Less than 2 miles to the northeast)
    • Waterloo is located in Monroe County (IL)
    • Jump to our Gazetteer entry for Waterloo
    • Population from the 2020 Census: 10,536 people
    • Jump to TripAdvisor's Tourism page for Waterloo <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.