Welcome to Boulder ...
Boulder is located in Clinton County<1>.
The pronunciation of Boulder: BOHL-der<2>
While we don't have a date for the founding of Boulder, you might consider that their post office opened in 1884.
When the people of Boulder refer to themselves (known as a demonym), they frequently use Boulderite<3>
Boulder is 460 feet [140 m] above sea level.<4>.
Time Zone: Boulder lies in the Central Time Zone (CST/CDT) and observes daylight saving time
Area Codes for Boulder: 618 & 730<5>
The ZIP code for Boulder: 62231<6>
Communities Also Named Boulder ...
Using our Gazetteer, we found that there are 10 communities that are also named Boulder - they are located in British Columbia, California, Colorado (2), Idaho, Montana, Utah, Virginia, West Virginia and Wyoming.
For more information, see our Tidbits & Trivia Page for Boulder.
Communities near Boulder ...
We have created a list of 10 communities that are near Boulder.
- Centralia
(12 miles [19.3 km] to the southeast)
- Salem
(15 miles [24.1 km] to the east)
- Greenville
(15 miles [24.1 km] to the northwest)
- Breese
(17 miles [27.4 km] to the west)
- Carlyle
(9 miles [14.5 km] to the southwest)
- Germantown
(19 miles [30.6 km] to the southwest)
- Sandoval
(8 miles [12.9 km] to the southeast)
- Wamac
(13 miles [20.9 km] to the south)
- Central City
(11 miles [17.7 km] to the southeast)
- Odin
(10 miles [16.1 km] to the southeast)
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 Boulder. Our list includes the location of those cemeteries and we provide an overhead view. See our Cemetery List for Boulder.
Using the information from an 1895 Atlas, we've created a list of communities that were in the area of Boulder. 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 Boulder.
We also have a detailed list of newspapers that have been published in the area around Boulder. See our Newspapers Page for Boulder.
TripAdvisor Tourism Pages for Boulder ...
Looking for more information about Boulder? 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 Boulder, there are neighboring communities that do have Tourism pages. A map of those communities can be found with our TripAdvisor Page for Boulder.
Adding Boulder to Our Gazetteer ...
We originally found mention of Boulder 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 Boulder was in the document titled List of Post Offices from Cameron Blevins and Richard Helbock.<8>
From that list, the Boulder post office opened in 1884. The Boulder post office closed in 1955.
For more details, see References and Mentions for Boulder.
Footnotes ...
| <1> | If you're interested in how the shape of Illinois' counties, including Clinton, 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 Boulder. 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> | A demonym is the name for a resident of a community which is usually derived from (or is related to) the name of that community. In other words, it's how the residents of Boulder refer to themselves. It's important to note that there aren't any rules for taking a community's name and turning it into a demonym. A demonym is informal and while the majority of Boulder may use one name, keep in mind that others may use something different. |
| <4> | The elevation is an estimate for the area around Boulder - 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 618 code has been Overlayed with the 730 area code. New phone numbers in the Boulder area will be assigned with one of these codes: 618 or 730. As a result, placing a call in the Boulder 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 community (such as Boulder). When looking for a ZIP Code, whether Boulder 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/ |