I think I know why. "The figure includes all individual and corporate income taxes, estate taxes, gift taxes, and excise taxes."
With all of that being split evenly among the population you get those numbers. That doesnt mean shit though because of how few people are actually there.
That still didn't explain it to me - California has more corporations, rich people etc. - but I think you were close.
One word answers the question divided amonth the population I bet:
Wal-Mart.
World's biggest retailer in a rural state.