| Official Zip Code Name | Alcester |
| Zip Code State | South Dakota |
| Primary County: | Union |
| Area Code | 605 |
| Current Population: | 37081 |
| Racial Majority: | White 62.49% |
| Median Household Income | $55618 |
| Average Adjusted Gross Income | $89060 |
| Time Zone: | 6 |
| Elevation Range | 1436 ft. |
| Area | 99.249 Sqm. |
| Coordinates(Y,X) | 43.003944, -96.610094 |