| Official Name: | Altmar, Illinois |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Illinois#USA |
| Pushpin Label: | Altmar |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | LaSalle |
| Subdivision Type3: | Township |
| Subdivision Name3: | Eagle |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 640 |
| Coordinates: | 41.1419°N -88.8925°W |
| Area Codes: | 815 & 779 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 422404 |
Altmar is an unincorporated community in Eagle Township, LaSalle County, Illinois, United States. Altmar is located along the Norfolk Southern Railway, 1miles west of Kangley.[1]
The community may be named after Altmar, New York.[2]