| City : | Alder |
| County : | Madison County, Salem County |
| State : | Montana (MT) |
| Land Area : | 2.01 sq mi |
| Water Area : | 0.00 sq mi |
| Latitude : | 45.3215896 |
| Longitude : | -112.1092159 |
| Population (2010): | 103 |
| Population Estimate (2012) : | 138 |
| Population Density : | 51.33/sq mi |
| Housing Units (2012) : | 89 |
| Median Household Income (2012) : | $41,875 (Montana : $45,456, USA : $53,046) |
| Median Family Income (2012) : | $53,750 (Montana : $58,951, USA : $64,585) |
| Median House Price (2012) : | $83,300 (Montana : $183,000, USA : $181,400) |