| Official Name: | Atwater, Illinois |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Illinois#USA |
| Pushpin Label: | Atwater |
| Pushpin Label Position: | bottom |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Macoupin |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 633 |
| Coordinates: | 39.3328°N -89.725°W |
| Area Code: | 217 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 422421 |
Atwater is an unincorporated rural hamlet in Shaws Point Township, Macoupin County, Illinois, United States. Atwater is 3.5miles east-southeast of Standard City. There are several homes there, and a grainery, with no other businesses or services. Atwater had a post office, which closed on October 12, 2002.[1]