The main cities are the following: Tagish.
In term of hotels you can find 1 places (like "Six Mile River Resort"). For parks you have 1 places with "Tagish Bridge Recreation Site" for example.
In term of gas stations you can find 1 location in the region (like "Race Trac").
Are you looking for an apartment for sale/rent? Or interested by a house? You can check that on Realtor.ca.