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Welcome to Adelphi ...

Adelphi is primarily located in Prince George's County<1>. A portion of Adelphi extends into Montgomery County.

Adelphi was established in 1796.

Adelphi is 170 feet [52 m] above sea level.<2>.

Time Zone: Adelphi lies in the Eastern Time Zone (EST/EDT) and observes daylight saving time

Area Codes for Adelphi: 301, 227 & 240<3>

Communities Also Named Adelphi ...

Using our Gazetteer, we found that there are 4 communities that are also named Adelphi - they are located in Iowa, New York and Ohio (2).

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

Communities near Adelphi ...

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

  • Arlington
    (11 miles [17.7 km] to the southwest)
    • Arlington is located in Arlington County (VA)
    • Jump to our Gazetteer entry for Arlington
    • Population from the 2010 Census: 207,627 people
    • Jump to TripAdvisor's Tourism page for Arlington <4>
  • Alexandria
    (14 miles [22.5 km] to the south)
  • Rockville
    (11 miles [17.7 km] to the northwest)
  • Gaithersburg
    (15 miles [24.1 km] to the northwest)
  • Bowie
    (13 miles [20.9 km] to the east)
    • Bowie is located in Prince George's County
    • Jump to our Gazetteer entry for Bowie
    • Population from the 2020 Census: 58,212 people
    • Jump to TripAdvisor's Tourism page for Bowie <4>
  • Laurel
    (9 miles [14.5 km] to the northeast)
    • 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 <4>
  • Greenbelt
    (4 miles [6.4 km] to the east)
    • 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 <4>
  • Hyattsville
    (3 miles [4.8 km] to the south)
  • Vienna
    (17 miles [27.4 km] to the southwest)
    • Vienna is located in Fairfax County (VA)
    • Jump to our Gazetteer entry for Vienna
    • Population from the 2020 Census: 16,518 people
    • Jump to TripAdvisor's Tourism page for Vienna <4>
  • Falls Church
    (13 miles [20.9 km] to the southwest)

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

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

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

TripAdvisor Tourism Pages for Adelphi ...

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

Adding Adelphi to Our Gazetteer ...

We originally found mention of Adelphi 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 Adelphi was in the document titled List of Post Offices from Cameron Blevins and Richard Helbock.<5>

From that list, the Adelphi post office opened in 1880. The Adelphi post office closed in 1880.

For more details, see References and Mentions for Adelphi.

Footnotes ...

<1>If you're interested in how the shape of Maryland's counties, including Prince George's, have changed over time, we recommend the Atlas of Historical County Boundaries.
<2>The elevation is an estimate for the area around Adelphi - it will be higher in some places and lower in others.
<3>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 Adelphi area will be assigned with one of these codes: 301, 227 or 240. As a result, placing a call in the Adelphi area will require 10-digit dialing (where you enter both the area code and then the phone number).
<4>While we're fans and frequent users of TripAdvisor, you should know that we're also members of the TripAdvisor affiliate program.
<5>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/