Hi Jennifer!
Can't say as though I miss the Minnesota cold - gets below freezing down here in Kentucky and I'm miserable. It's more of a damp, bone chilling cold.
If I'm reading your post correctly, you might be trying to import the "old" VHF system for the state patrol, which they no long use around your neck of the woods. MSP is on the ARMER system.
So when you are doing your import using Freescan, look for the Allied Radio Matrix for Emergency Response (ARMER) (APCO P25) in Minnesota.
I'd include all of the MSP talkgroups (listed as Minnesota Department of Public Safety - State Patrol Talkgroups), along with all of the Chisago County talkgroups. Probably wouldn't hurt to add the Interoperability talkgroups too.
As far as which sites to import, you should look at the WIKI page below. It shows the sites in your county.
Chisago County (MN) - The RadioReference Wiki
You may want to also import the sites for counties adjacent to Chisago. Your scanner has sufficient memory capacity for these.