| Official Name: | Platte Colony, South Dakota |
| Settlement Type: | Census-designated place |
| Pushpin Map: | South Dakota#USA |
| Pushpin Label: | Platte Colony |
| Coordinates: | 43.4678°N -99.1261°W |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | South Dakota |
| Subdivision Type2: | County |
| Subdivision Name2: | Charles Mix |
| Area Footnotes: | [1] |
| Area Total Sq Mi: | 0.31 |
| Area Land Sq Mi: | 0.31 |
| Area Water Sq Mi: | 0.00 |
| Area Total Km2: | 0.80 |
| Area Land Km2: | 0.80 |
| Area Water Km2: | 0.00 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Density Km2: | 374.64 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 1706 |
| Postal Code Type: | ZIP Code |
| Postal Code: | 57361 (Platte) |
| Area Code: | 605 |
| Blank Name: | FIPS code |
| Blank Info: | 46-50310 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2813004 |
| Population Total: | 299 |
| Unit Pref: | Imperial |
| Population Density Sq Mi: | 970.78 |
Platte Colony is a Hutterite colony[3] and census-designated place (CDP) in Charles Mix County, South Dakota, United States. It was first listed as a CDP prior to the 2020 census. The population of the CDP was 299 at the 2020 census.[4]
It is in the northwest corner of the county, northwest of Platte, the nearest incorporated place. It is 2miles northeast of Lake Francis Case, a reservoir on the Missouri River.