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Welcome to Illiopolis ...

The village of Illiopolis is located in Sangamon County<1>.

The pronunciation of Illiopolis: il-lee-OP-oh-luhs<2>

While we don't have a date for the founding of Illiopolis, you might consider that their post office opened in 1867.

From the  Census Estimates for 2019, Illiopolis has a population of 844 people<3> (see below for details).

Illiopolis is 600 feet [183 m] above sea level.<4>.

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

Area Codes for Illiopolis: 217 & 447<5>

The ZIP code for Illiopolis: 62539<6>

Population Details ...

Taken from the 2019 Census Estimates, Illiopolis had an population of 844 people. This is a decrease of 5.27% since the 2010 Census (or a decrease of 7.86% since the 2000 Census).

At the time of the 2010 Census, Illiopolis had a population of 891 people. This makes Illiopolis the county's 15th most populous community.

With a 2010 count of 891 people, the population of Illiopolis decreased 2.73% from the 2000 Census (which had a count of 916 people).

More information can be found on the Census Page for Illiopolis.

Communities near Illiopolis ...

We have created a list of 10 communities that are near Illiopolis.

To Help With Your Genealogy Research ...

We have a couple of sections for those tracing their genealogy.

We created a list of cemeteries that are in the area around Illiopolis. Our list includes the location of those cemeteries and we provide an overhead view. See our Cemetery List for Illiopolis.

Using the information from an 1895 Atlas, we've created a list of communities that were in the area of Illiopolis. Our list includes information such as whether the 1895 community had a post office or railroad service. See our List of 1890's Communities around Illiopolis.

We also have a detailed list of newspapers that have been published in the area around Illiopolis. See our Newspapers Page for Illiopolis.

TripAdvisor Tourism Pages for Illiopolis ...

Looking for more information about Illiopolis? A wonderful source is the TripAdvisor website. We always start with the TripAdvisor Tourism page, where you can read an overview with links that will help you find lodging, restaurants and attractions.

In addition to the Tourism page for Illiopolis, there are neighboring communities that also have Tourism pages. More information about those communities can be found on our TripAdvisor Page for Illiopolis.

Adding Illiopolis to Our Gazetteer ...

We originally found mention of Illiopolis in both the FIPS-55 and the GNIS. For more information, see the FIPS and GNIS Codes sections on our Miscellaneous Page.

From our notes, the earliest published mention we've found (so far) for Illiopolis was in the document titled List of Post Offices from Cameron Blevins and Richard Helbock.<8>

From that list, the Illiopolis post office opened in 1867.

For more details, see References and Mentions for Illiopolis.

Footnotes ...

<1>If you're interested in how the shape of Illinois' counties, including Sangamon, have changed over time, we recommend the Atlas of Historical County Boundaries.
<2>The pronunciation we've provided is our attempt to give a phonetic pronunciation for Illiopolis. While it might not be exactly right, hopefully it will be close. If we have it wrong or there's a better way to pronounce the name, please contact us through our Feedback Page.
<3>Population counts have been provided by the U.S. Census Bureau. For more detail, please visit our Census Page for Illiopolis.
<4>The elevation is an estimate for the area around Illiopolis - it will be higher in some places and lower in others.
<5>When there's a risk of an area code running out of phone numbers, an 'Overlay Area Code' is created that has the same geographic boundaries as the existing area code. In this case, the 217 code has been Overlayed with the 447 area code. New phone numbers in the Illiopolis area will be assigned with one of these codes: 217 or 447. As a result, placing a call in the Illiopolis area will require 10-digit dialing (where you enter both the area code and then the phone number).
<6>ZIP Codes have been created by the United States Postal Service (USPS) as a way of grouping addresses to make delivery more efficient. The boundaries of the ZIP Code can be changed, re-assigned, eliminated or overlapped with other ZIP Codes. So keep in mind that any given ZIP Code is only 'loosely' associated with a village (such as Illiopolis). When looking for a ZIP Code, whether Illiopolis or elsewhere, it's always best to check the website of the United States Postal Service (USPS).
<7>While we're fans and frequent users of TripAdvisor, you should know that we're also members of the TripAdvisor affiliate program.
<8>A copy of the Blevins & Helbock Post Office list with background information can be found at:

      https://cblevins.github.io/us-post-offices/data-biography/