Besides the several numbers included in this interesting article, there is this statement: "Indiana’s philosophy of promoting choice has also extended to making it possible for students to apply to any public school—including those outside the school district in which the child lives."

For more than twenty years now, all public schools anywhere in Minnesota offer open enrollment to all students anywhere in the state, up to the limits of the capacity of each school district to receive students.

http://education.state.mn.us/MDE/StuSuc/EnrollChoice/index.h...

State funding of each school district is of course based on enrollment.

http://www.house.leg.state.mn.us/hrd/pubs/mnschfin.pdf

More students means more enrollment, so school districts make efforts to provide attractive programs that will bring students across district lines. This competition among school districts has promoted innovation in programs and resulted in a fair amount of interchange among students who live in different neighborhoods.