Where the wealthiest people live. And everybody else.
Colorado seems the most covered.
The map says LaSalle County is the place for millionaires in Texas. Poverty rate for the county (2000 census) shows per capita income $9,692; with 28.2% of families, 29.8% of total population and 24.8% 65 or older living under poverty rate. Wikipedia says La Salle is one of the poorest counties in the U.S., based on per capita income.
Another search shows 10-acre plots selling around $84,000. That much an acre in a sparsely populated county is s heck of a lot of money.
Link at maggiesfarm.