Without hunting a highfence area. You are looking at Oklahoma, New Mexico or Texas. Not close but as close as it gets. Iowa has a few places for wild boar like mentioned behind high fence. There is also a high fence place over in Northwest Colorado that has wild boar.
Are you from Wyoming? Unfortunately, itis definitely out as the pigs wouldn't survive the winters. I grew up there and didn't know what a wild hog was until I moved to Texas.
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The Rebellion's "Oklahoma Twister of Words"...