Governing magazine has posted a map illustrating pre-K enrollment for three and four-year-olds on a state-by-state basis throughout the US.  The map also provides data on 2010-2011 spending figures compiled by the National Institute for Early Education Research.  As described by Governing,

Pre-K funding has declined in most states, with some areas reporting significant reductions. At the same time, state early education enrollment rose by nearly 31,000 last year. Nationwide, 28 percent of 4-year-olds and 4.3 percent of 3-year-olds attended a state pre-k program.

For more information, see Governing Data’s, Pre-K Enrollment and Funding: State Totals.