Old Post No. 43 (2006 Population 394) is a rural municipality in southern Saskatchewan, Canada encompassing 1,757.00 square kilometers in area. The rural municipality in conjunction with the provincial government is in charge of maintenance of highways in its area. As well, the municipality provides policing, fire protection and municipal governance for the rural district, with a reeve as its administrator.
The RM's southern boundary is the United States border with Valley County and Daniels County in Montana.
In 2006, Old Post No. 43 had a population of 394 in 168 dwellings, a -17.1% decrease from 2001. On a surface of 1,757.00 km² it has a density of 0.2 inhabitants/km².
The following communities are located in this municipality:
Villages
Hamlets
The rural municipality is a part owner of the Fife Lake Railway.
Events;
There is one heritage building located within the rural municipality:
Coordinates: 49°13′31″N 106°16′32″W / 49.22528°N 106.27556°W