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

So far, we found very little information about Triadelphia. The little that we've found leads us believe that the community is historic.<1>

We've added Triadelphia to our Gazetteer with the hope that we can develop more information. If you can help us with Triadelphia, please Contact Us.

Triadelphia would have been located within present day Montgomery County<2>.

While we don't have a date for the founding of Triadelphia, you might consider that their post office opened in 1846.

While the community is gone, the present day location for Triadelphia is 360 feet [110 m] above sea level.<3>.

Time Zone: The area where Triadelphia was located is in the Eastern Time Zone (EST/EDT) and observes daylight saving time

The Area Codes where Triadelphia was located: 301, 227 & 240<4>

Communities Also Named Triadelphia ...

Using our Gazetteer, we found that there are two Maryland communities named Triadelphia: This one is located in Montgomery County and the other is located in Howard County.

Beyond Maryland, there are 3 communities that are also named Triadelphia - they are located in Ohio and West Virginia.

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

Websites for Triadelphia ...

Chamber of Commerce:   www.montgomerycountychamber.com/

Although we don't have any websites that are specific to Triadelphia, the following might be of interest:

Communities near Triadelphia ...

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

  • Rockville
    (11 miles [17.7 km] to the southwest)
  • Gaithersburg
    (10 miles [16.1 km] to the southwest)
  • College Park
    (17 miles [27.4 km] to the south)
  • Laurel
    (13 miles [20.9 km] to the southeast)
    • Laurel is located in Prince George's County
    • Jump to our Gazetteer entry for Laurel
    • Population from the 2020 Census: 25,548 people
    • Jump to TripAdvisor's Tourism page for Laurel <5>
  • Greenbelt
    (18 miles [29 km] to the southeast)
    • Greenbelt is located in Prince George's County
    • Jump to our Gazetteer entry for Greenbelt
    • Population from the 2020 Census: 23,229 people
    • Jump to TripAdvisor's Tourism page for Greenbelt <5>
  • Hyattsville
    (19 miles [30.6 km] to the south)
  • Takoma Park
    (17 miles [27.4 km] to the south)
  • Mount Airy
    (11 miles [17.7 km] to the northwest)
  • Riverdale Park
    (19 miles [30.6 km] to the south)
  • Riverdale
    (19 miles [30.6 km] to the south)
    • Riverdale is located in Prince George's County
    • Jump to our Gazetteer entry for Riverdale

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

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

Adding Triadelphia to Our Gazetteer ...

We originally found mention of Triadelphia in the GNIS. For more information, see the Referenced GNIS Codes section on our Miscellaneous Page.

From our notes, the earliest published mention we've found (so far) for Triadelphia was in the book titled U.S. Post Offices (Oct. 1846).

For more details, see References and Mentions for Triadelphia.

Footnotes ...

<1>We use the term 'Historic' broadly and it generally means that the community no longer exists. However, it can also mean that the community might still exist, but was significantly larger or had a more 'official' existence in the past than it does now. Unfortunately our sources of data have proven to be unreliable. If you can provide us with more specific information about Triadelphia, please let us know so that we can improve our accuracy.
<2>If you're interested in how the shape of Maryland's counties, including Montgomery, have changed over time, we recommend the Atlas of Historical County Boundaries.
<3>The elevation is an estimate for the area around Triadelphia - 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 301 code has been Overlayed with one of the following codes: 227 or 240. New phone numbers in the Triadelphia area will be assigned with one of these codes: 301, 227 or 240. As a result, placing a call in the Triadelphia area will require 10-digit dialing (where you enter both the area code and then the phone number).
<5>While we're fans and frequent users of TripAdvisor, you should know that we're also members of the TripAdvisor affiliate program.