If we encounter the name of what might be a community, our methodology is to add that name to our Gazetteer. For example, we might find a sentence like "He went north past Mackay and then turned east". While Mackay could be some kind of landmark, we think that it's more likely to be a community. We've added Mackay as a placeholder with the hope that we'll be able to add more information in the future.
Just as a reminder: Our definition of a community is rather broad and includes those places (or areas) where several families lived and had a name which identified that place. For example, you might hear somebody say that they are going over to Bird Creek to see Pete ... Bird Creek is just a gas station and a couple of homes at the crossroads. While it might not be on the map, everybody in the area knows it by that name.
Places of interest include buildings at a crossroad, several families clustered in a hollow or maybe the location of a way station. It also includes places like mines, lumber camps, ferry crossings, etc. The community might still exist, is now gone or only existed for just a short period of time.
Also keep in mind that Mackay could have been on the original document by mistake, misspelled, the original/alternate name of a community that we've listed elsewhere or was placed in the wrong . Sometimes a post office or train station would have a different name than the community where it's located, so two names might be referring to the same community - we're working to straighten it all out.
Since confusion between is common, we searched and weren't able to find another Alberta community named Mackay.
Unless noted otherwise, the population counts we use should be considered estimates. Our population values for Mackay were taken from various sources and although they can be traced back to Statistics Canada (StatCan), they should not be considered official.