Given you are in Minnesota, you'll probably get (and need) better answers on this by asking this question in the Minnesota forum.
Having said that, the first step is always going to be checking the database here. Still, keep in mind that most of the data here is submitted by other scanner users vs. system owners (the latter of which tend to keep all of this information "close hold'). Therefore, the database is only one tool that you have to help gather information.
As Clint said, looking at
the ARMER system, there isn't "E"ncryption listed but that is not an absolute. The information listed for Koochiching County(and other counties on this systems) is a bit suspect. It appears that all but two talkgroups are simply talkgroups based on the talkgroup id range vs. fully identified talkgroups. One of the two with more specific labels seems a bit uncertain as well. I see alot of the same thing for other counties on ARMER as well.
My point is - there could be various reasons why the talkgroups are listed that way.
In a best case scenario, these talkgroups are active but no one has yet determined their actual usage (and/or taken the time to submit that information to help others like you).
However, it could also be because these talkgroups are encrypted so no one really knows what is on them.
As far as things marked as "encrypted", see the dread "E" (or "e") these days in the "Mode" column (click on the column header for descriptions), there is an example (possibly) that shows the "E" isn't always applied to the data.
There is a talkgroup under "Lac Qui Parle County" that is labeled "County Encrypted All". However, you'll note that the "Mode" column does not indicate "E" for encryption.
One last suggestion for now - you may want to click on the small red and white triangle symbol in the upper right hand corner and have this discussion moved to the Minnesota forums to potentially get better answers.
EDIT: looking closer, while they do not appear to be (directly) assigned or used in your your county, there are about 90 talkgroups listed on the ARMER system that have the word "encrypted" in their description -- 82 of which
do not have the "E" or "e" in the "Mode" column.
EDIT 2: looking even closer I see even more use of encryption on the system that isn't marked with an "E" or "e"