| City : | Old Agency |
| County : | Gaston County, Sanders County |
| State : | Montana (MT) |
| Land Area : | 0.58 sq mi |
| Water Area : | 0.09 sq mi |
| Latitude : | 47.3251155 |
| Longitude : | -114.2975432 |
| Population (2010): | 107 |
| Population Estimate (2012) : | 162 |
| Population Density : | 184.86/sq mi |
| Housing Units (2012) : | 38 |
| Median Household Income (2012) : | $21,875 (Montana : $45,456, USA : $53,046) |
| Median Family Income (2012) : | $23,750 (Montana : $58,951, USA : $64,585) |
| Median House Price (2012) : | $60,000 (Montana : $183,000, USA : $181,400) |
Old Agency Zip Codes
| 59831 (454) |