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By "smaller" do you mean Seward/Homer etc. or small towns in the bush? Many Alaska towns are very small indeed. Most towns on the road system big enough to have a bank branch will have ATMs.
Denali has tourists...yes there are plenty of atm's. Oh how I loved denali. 12 hours on a school bus but I do it again in a second...it was magnificent...geez I can't remember the last time I used the word magnificent. Have fun!