Oacoma, South Dakota
Oacoma: township in Lyman County, South Dakota
About
Oacoma is a township located in the county of Lyman in the U.S. state of South Dakota. Its population at the 2010 census was 71. After 10 years in 2020 city had an estimated population of 70 inhabitants.
Quick Facts about Oacoma
| Population | 70 (2020) |
| Country | United States of America |
| State | South Dakota (United States) |
| County | Lyman County |
| Latitude & Longitude | 43.7961,-99.3957 |
| Time Zone | America/Chicago |
| Local time | 19:45:17 (22nd April 2026) |
| Postal code | 57365 |
| Population growth | -1.43% (2010-2020) |
| Weather | 89℉ Mostly Sunny 7-days weather |
Geography
Oacoma is located at 43°47'46"N 99°23'44"W (43.7961100, -99.3956600).
Oacoma map
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Weather
89°F
Mostly Sunny
10 to 30 mph SSE
Wednesday
Mostly sunny, with a high near 89.
7-Day ForecastDemographics
According to census records, the population of Oacoma decreased by 1.43% in 10 years.
| Year | Population | % Change | Method |
|---|---|---|---|
| 2010 | 71 | - | census |
| 2011 | 72 | 1.39% | estimation process |
| 2012 | 71 | -1.41% | estimation process |
| 2013 | 74 | 4.05% | estimation process |
| 2014 | 74 | 0% | estimation process |
| 2015 | 74 | 0% | estimation process |
| 2016 | 74 | 0% | estimation process |
| 2017 | 74 | 0% | estimation process |
| 2018 | 72 | -2.78% | estimation process |
| 2019 | 71 | -1.41% | estimation process |
| 2020 | 70 | -1.43% | estimation process |
Oacoma zip code is 57365.
County name: Lyman, County
fips: 46085
Sherman
Services and Civic Places in Oacoma
1Oacoma City Finance Office
E 3rd St, Oacoma, SD 57365 View details
Phone: +16057344455 | Website available
Closest post offices linked to Oacoma.
| Post Office Name | City | ZIP |
|---|---|---|
| Oacoma Post Office | Oacoma (SD) | 57365 |
Other cities in Lyman County
Cities, towns, neighborhoods & other populated places in Lyman County , SD.
| City Name | Population | Title |
|---|---|---|
| Lower Brule | 613 | Township in Lyman County, South Dakota |
| Presho | 489 | Human settlement in Lyman County, South Dakota, United States of America |
| Kennebec | 247 | City in and county seat of Lyman County, South Dakota, United States |
| Reliance | 210 | Town in Lyman County, South Dakota, United States |
| Vivian | 145 | Census-designated place in Lyman County, South Dakota, United States |
| Iona | 81 | Unincorporated community in South Dakota |