http://www.mariondaily.com/
http://www.cityofmarionil.gov/
http://www.americantowns.com/il/marion

The above three links should give you all the information about Marion Illinois you are looking for, just copy one at a time and paste them into your browser and then explore each site searching for what you are looking for.
As far as heating costs go, that depends on the kind of property you are going to buy, i.e. condo, townhouse, or single family home, larger or smaller property and the kind of winter the area will have, and also where you set your thermostat, i.e. what is comfortable to you ....
Hope this all will help you!
If you finally decide to move to Marion, and you need a local experienced Realtor, contact me and I gladly connect you with an trusted Partner agent there!

Do you also need information about Paducha Ky, let me know!

Edith Karoline YourRealtor4Life
Working always in the very BEST interest of her clients
EdithDoesItRight@yahoo.com or EdithSellsHomes@gmail.com