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Welcome to Hennepin ...

The village of Hennepin is located in Putnam County<1> and is the County Seat for Putnam County.

The pronunciation of Hennepin: HEN-nuh-pin<2>

While we don't have a date for the founding of Hennepin, you might consider that their post office opened in 1831.

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

From the  Census Estimates for 2019, Hennepin has a population of 707 people<3> (see below for details).

Hennepin is 540 feet [165 m] above sea level.<4>.

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

Area Codes for Hennepin: 815 & 779<5>

The ZIP code for Hennepin: 61327<6>

Population Details ...

Taken from the 2019 Census Estimates, Hennepin had an population of 707 people. This is a decrease of 6.61% since the 2010 Census.

At the time of the 2010 Census, Hennepin had a population of 757 people (or 12.59% of the total population of Putnam County). This makes Hennepin the county's 2nd most populous community.

With a 2010 count of 757 people, the population of Hennepin increased 7.07% from the 2000 Census (with a count of 707 people).

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

Communities Also Named Hennepin ...

Using our Gazetteer, we found that there are 2 communities that are also named Hennepin - they are located in Oklahoma and Quebec.

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

Communities near Hennepin ...

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

  • Peru
    (11 miles [17.7 km] to the northeast)
    • Peru is located in La Salle County
    • Jump to our Gazetteer entry for Peru
    • Population from the 2020 Census: 9,612 people
    • Jump to TripAdvisor's Tourism page for Peru <7>
  • La Salle
    (14 miles [22.5 km] to the northeast)
  • Princeton
    (11 miles [17.7 km] to the northwest)
  • Spring Valley
    (8 miles [12.9 km] to the northeast)
  • Oglesby
    (13 miles [20.9 km] to the east)
  • Henry
    (9 miles [14.5 km] to the south)
    • Henry is located in Marshall County
    • Jump to our Gazetteer entry for Henry
    • Population from the 2020 Census: 2,230 people
    • Jump to TripAdvisor's Tourism page for Henry <7>
  • Lacon
    (16 miles [25.7 km] to the south)
    • Lacon is located in Marshall County
    • Jump to our Gazetteer entry for Lacon
    • Population from the 2020 Census: 1,713 people
    • Jump to TripAdvisor's Tourism page for Lacon <7>
  • De Pue
    (5 miles [8 km] to the north)
    • De Pue is located in Bureau County
    • Jump to our Gazetteer entry for De Pue
    • Population from the 2020 Census: 1,665 people
  • North Utica
    (16 miles [25.7 km] to the northeast)
    • North Utica is located in La Salle County
    • Jump to our Gazetteer entry for North Utica
    • Population from the 2020 Census: 1,333 people
  • Granville
    (4 miles [6.4 km] to the east)

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

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

We also have a detailed list of newspapers that have been published in the area around Hennepin. Our list includes 13 papers. See our Newspapers Page for Hennepin.

TripAdvisor Tourism Pages for Hennepin ...

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

Adding Hennepin to Our Gazetteer ...

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

From that list, the Hennepin post office opened in 1831.

For more details, see References and Mentions for Hennepin.

Footnotes ...

<1>If you're interested in how the shape of Illinois' counties, including Putnam, 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 Hennepin. 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 Hennepin.
<4>The elevation is an estimate for the area around Hennepin - 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 815 code has been Overlayed with the 779 area code. New phone numbers in the Hennepin area will be assigned with one of these codes: 815 or 779. As a result, placing a call in the Hennepin 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 Hennepin). When looking for a ZIP Code, whether Hennepin 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/