McCook Lake, South Dakota
McCook Lake: Situated in the southeastern corner of South Dakota within Union County, this oxbow lake was formed by a historic shift in the channel of the Missouri River.
About
McCook Lake is a city located in the county of Union in the U.S. state of South Dakota.
Quick Facts about McCook Lake
| State | South Dakota (United States) |
| County | Union County |
| Latitude & Longitude | 42.5417,-96.5059 |
| Time Zone | America/Chicago |
| Local time | 01:27:20 (7th November 2026) |
| Weather | 34℉ Mostly Cloudy 7-days weather |
Geography
McCook Lake is located at 42°32'30"N 96°30'21"W (42.5416600, -96.5058600).
McCook Lake map
Click "full screen" 
icon to open full mode. View satellite images
icon to open full mode. View satellite images
Weather
34°F
Mostly Cloudy
5 mph SSE
Friday Night
Mostly cloudy, with a low around 34. South southeast wind around 5 mph.
7-Day ForecastNearby Schools and Colleges
Schools and campuses linked to McCook Lake, SD. Select a name to open its map and contact details.
| Code | Name | City | ZIP |
|---|---|---|---|
| 152992 | Briar Cliff University | Sioux City (IA) | 51104 |
| 154262 | St Luke's College | Sioux City (IA) | 51104-0263 |
| 154004 | Morningside College | Sioux City (IA) | 51106-1751 |
| 154572 | Western Iowa Tech Community College | Sioux City (IA) | 51102-5199 |
Closest post offices linked to McCook Lake.
| Post Office Name | City | ZIP |
|---|---|---|
| North Sioux City Post Office | North Sioux City (SD) | 57049 |
Other cities in Union County
Cities, towns, neighborhoods & other populated places in Union County , SD.
| City Name | Population | Title |
|---|---|---|
| North Sioux City | 2,928 | City in Union County South Dakota, United States |
| Beresford | 1,609 | City in South Dakota, United States of America |
| Jefferson | 1,159 | City in South Dakota, United States |