To look at it another way, here's the number of people per hundred-thousand residents who moved to Idaho from each state. I.e. the number in the chart above divided by each state's population/100k and rounded off. (I used Wikipedia's 2017 state population estimates, and the chart is for 2016 immigration, so the numbers might off by a small amount, but the rankings should be accurate.)
Texas | 9 |
California | 43 |
Colorado | 55 |
Arizona | 62 |
Oregon | 68 |
Nevada | 110 |
Washington | 127 |
Utah | 239 |
Wyoming | 523 |
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This explains why most Californians don't know anyone who wants to move to Idaho, while Idahoans think lots of Californians are coming. Really it's the Wyomingites who are leaving in droves, but there are so few of them to begin with they hardly make an impact on their destination.