Expanse is too small to be enumerated as a separate entity during the census taking, so it was a part of the population given for RM of Lake Johnston No.

Today the former community school, a private residence, a Historical marker and a few foundations are all that remain of Expanse's prosperous pioneer days.

The post office was formed on September 1, 1908, under the name Lake Johnston with postmaster Frank E. Crosby and was located at Sec.12, Twp.12, R.29, W of the 2nd meridian.

Taken from the town's Historical marker, erected in 1994 by the Rural municipality of Johnston Lake and the Saskatchewan History & Folklore Society Inc.: Canadian Pacific Railway purchased the townsite in 1911 and named it Expanse.

As an "end of Track" Boom Town, homesteaders got supplies and brought grain to Expanse from as far south as the United States border.