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A Gazetteer for the United States and Canada
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Welcome to Oacoma ...

The town of Oacoma is located in Lyman County<1>.

The pronunciation of Oacoma: oh-uh-KOH-muh<2>

While we don't have a date for the founding of Oacoma, you might consider that their post office opened in 1890.

From the  Census Estimates for 2019, Oacoma has a population of 471 people<3> (see below for details).

Oacoma is 1,370 feet [418 m] above sea level.<4>.

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

Area Code for Oacoma: 605

The ZIP code for Oacoma: 57365<5>

Population Details ...

Taken from the 2019 Census Estimates, Oacoma had an population of 471 people. This is an increase of 4.43% since the 2010 Census (or an increase of 20.77% since the 2000 Census).

At the time of the 2010 Census, Oacoma had a population of 451 people (which is 11.99% of the total population of Lyman County). This makes Oacoma the county's 3rd most populous community.

The population of Oacoma represents 0.06% of the total population of South Dakota (which has 814,180 people), making it the state's 168th most populous community.

With a 2010 count of 451 people, the population of Oacoma increased 15.64% from the 2000 Census (which had a count of 390 people).

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

Communities near Oacoma ...

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

  • Fort Thompson
    (18 miles [29 km] to the north)
  • Pukwana
    (10 miles [16.1 km] to the east)
  • Reliance
    (12 miles [19.3 km] to the northwest)
  • East Lyman
    (10 miles [16.1 km] to the northwest)
    • East Lyman is located in Lyman County
    • Jump to our Gazetteer entry for East Lyman
    • Estimated population in 2019: 145 people
  • Ola
    (16 miles [25.7 km] to the southeast)
    • Ola is located in Brule County
    • Jump to our Gazetteer entry for Ola
    • Estimated population in 2014: 108 people
  • Shelby
    (14 miles [22.5 km] to the northeast)
    • Shelby is located in Buffalo County
    • Jump to our Gazetteer entry for Shelby
    • Estimated population in 2014: 96 people
  • Iona
    (17 miles [27.4 km] to the south)
  • Lyman
    (18 miles [29 km] to the west)
    • Lyman is located in Lyman County
    • Jump to our Gazetteer entry for Lyman
    • Estimated population in 2014: 43 people
  • Crow Creek
    (13 miles [20.9 km] to the northeast)
    • Crow Creek is located in Buffalo County
    • Jump to our Gazetteer entry for Crow Creek
  • Hamill
    (20 miles [32.2 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 Oacoma. Our list includes the location of those cemeteries and we provide an overhead view. See our Cemetery List for Oacoma.

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

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

TripAdvisor Tourism Pages for Oacoma ...

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

Adding Oacoma to Our Gazetteer ...

We originally found mention of Oacoma 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 Oacoma was in the document titled List of Post Offices from Cameron Blevins and Richard Helbock.<7>

From that list, the Oacoma post office opened in 1890.

For more details, see References and Mentions for Oacoma.

Footnotes ...

<1>If you're interested in how the shape of South Dakota's counties, including Lyman, 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 Oacoma. 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 Oacoma.
<4>The elevation is an estimate for the area around Oacoma - it will be higher in some places and lower in others.
<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 town (such as Oacoma). When looking for a ZIP Code, whether Oacoma 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.
<7>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/