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Welcome to Monmouth ...

The city of Monmouth is located in Warren County<1> and is the County Seat for Warren County.

The pronunciation of Monmouth: MON-muhth<2>

While we don't have a date for the founding of Monmouth, you might consider that their post office opened in 1841.

See our Genealogy Helper Page for Monmouth for more information about variations on the name of Monmouth.

From the  Census Estimates for 2019, Monmouth has a population of 8,870 people<3> (see below for details).

Monmouth is 730 feet [223 m] above sea level.<4>.

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

Area Codes for Monmouth: 309 & 861<5>

The ZIP code for Monmouth: 61462<6>

Population Details ...

Taken from the 2019 Census Estimates, Monmouth had an population of 8,870 people. This is a decrease of 6.08% since the 2010 Census (or a decrease of 9.87% since the 2000 Census).

At the time of the 2010 Census, Monmouth had a population of 9,444 people (or 53.32% of the total population of Warren County). This makes Monmouth the county's most populous community.

The population of Monmouth represents 0.07% of the population of Illinois (which has 12,830,632 people), making it the state's 230th most populous community.

With a 2010 count of 9,444 people, the population of Monmouth decreased 4.03% from the 2000 Census (with a count of 9,841 people).

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

Communities Also Named Monmouth ...

Using our Gazetteer, we found that there are 9 communities that are also named Monmouth - they are located in Alabama, California, Indiana, Iowa, Kansas (3), Maine and Oregon.

For more information, see our Tidbits & Trivia Page for Monmouth.

Websites for Monmouth ...

Official Website: www.ci.monmouth.il.us/

Communities near Monmouth ...

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

  • Galesburg
    (14 miles [22.5 km] to the east)
  • Abingdon
    (14 miles [22.5 km] to the southeast)
  • Knoxville
    (18 miles [29 km] to the east)
  • Oquawka
    (16 miles [25.7 km] to the west)
  • Roseville
    (12 miles [19.3 km] to the south)
  • Alexis
    (11 miles [17.7 km] to the northeast)
  • Stronghurst
    (18 miles [29 km] to the southwest)
  • East Galesburg
    (17 miles [27.4 km] to the east)
    • East Galesburg is located in Knox County
    • Jump to our Gazetteer entry for East Galesburg
    • Population from the 2020 Census: 761 people
  • Kirkwood
    (6 miles [9.7 km] to the southwest)
  • Keithsburg
    (19 miles [30.6 km] to the northwest)

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 Monmouth. Our list includes the location of those cemeteries and we provide an overhead view. See our Cemetery List for Monmouth.

Using the information from an 1895 Atlas, we've created a list of communities that were in the area of Monmouth. 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 Monmouth.

We also have a detailed list of newspapers that have been published in the area around Monmouth. Our list includes 19 papers. See our Newspapers Page for Monmouth.

TripAdvisor Tourism Pages for Monmouth ...

Looking for more information about Monmouth? 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 Monmouth, there are neighboring communities that also have Tourism pages. More information about those communities can be found on our TripAdvisor Page for Monmouth.

Adding Monmouth to Our Gazetteer ...

We originally found mention of Monmouth 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 Monmouth was in the document titled List of Post Offices from Cameron Blevins and Richard Helbock.<8>

From that list, the Monmouth post office opened in 1841.

For more details, see References and Mentions for Monmouth.

Footnotes ...

<1>If you're interested in how the shape of Illinois' counties, including Warren, 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 Monmouth. 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 Monmouth.
<4>The elevation is an estimate for the area around Monmouth - 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 309 code has been Overlayed with the 861 area code. New phone numbers in the Monmouth area will be assigned with one of these codes: 309 or 861. As a result, placing a call in the Monmouth 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 city (such as Monmouth). When looking for a ZIP Code, whether Monmouth 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/