How Do YOU Pronounce it?
Growing up in northern California, I didn't come across many town names that I couldn't pronounce just by looking at them until I came to Yakima, Washington.
That last one was what my sixth-grade mind created and used to call Yakima before I grew older and more appreciative of the valley.
Just a year or two after moving into town, I remember friends coming to visit saying they'd just driven through Naches, Washington. They pronounced it "nachos."
There are a ton of towns in Washington state, but I am sure we can find the top 10.