The federal budget provides about 30 percent of state revenue, making it the largest single source of funds for many states. But the feds are more generous with some states than with others, according to an analysis by Federal Funds Information for States , which tracks budget policy. Some Western states receive a greater proportion of federal grants in the form of revenue from leasing rights to the rich resources being extracted on public lands. That's the primary reason why Wyoming rakes in the most federal dollars per capita. Some states receive fewer federal dollars because they operate relatively modest Medicaid programs that trigger a smaller amount of matching federal money. That's the primary reason why Nevada gets the least federal funding per capita.