RoadsideThoughts
A Gazetteer for the United States and Canada
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Welcome to Dennison ...

Dennison is located in Clark County<1>.

The pronunciation of Dennison: DEN-i-suhn<2>

While we don't have a date for the founding of Dennison, you might get a feel for it by knowing that the earliest mention that we've found (so far) was on a map dated 1881.

Dennison is 580 feet [177 m] above sea level.<3>.

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

Note: If you travel east from Dennison (for example, toward West Terre Haute (IN)), you will soon leave Central Time and cross into the Eastern Time Zone (EST/EDT).

Area Codes for Dennison: 217 & 447<4>

The ZIP code for Dennison: 62423<5>

Communities Also Named Dennison ...

Using our Gazetteer, we found that there are two Illinois communities named Dennison: This one is located in Clark County and the other is located in Williamson County.

Beyond Illinois, there are 9 communities that are also named Dennison - they are located in Arizona, Kansas, Louisiana, Michigan, Minnesota, Montana, Nebraska and Ohio.

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

Communities near Dennison ...

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

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

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

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

TripAdvisor Tourism Pages for Dennison ...

Looking for more information about Dennison? 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.

While we are unaware of a Tourism page that is specific to Dennison, there are neighboring communities that do have Tourism pages. A map of those communities can be found with our TripAdvisor Page for Dennison.

Adding Dennison to Our Gazetteer ...

We originally found mention of Dennison 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 Dennison was on a map titled Rand McNally Map (1881).

For more details, see References and Mentions for Dennison.

Footnotes ...

<1>If you're interested in how the shape of Illinois' counties, including Clark, 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 Dennison. 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>The elevation is an estimate for the area around Dennison - it will be higher in some places and lower in others.
<4>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 Dennison area will be assigned with one of these codes: 217 or 447. As a result, placing a call in the Dennison area will require 10-digit dialing (where you enter both the area code and then the phone number).
<5>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 community (such as Dennison). When looking for a ZIP Code, whether Dennison or elsewhere, it's always best to check the website of the United States Postal Service (USPS).
<6>While we're fans and frequent users of TripAdvisor, you should know that we're also members of the TripAdvisor affiliate program.