  Interdistrict school choice programs-where a student can be assigned to a
school outside of her district-are widespread in the US, yet the market-design
literature has not considered such programs. We introduce a model of
interdistrict school choice and present two mechanisms that produce stable or
efficient assignments. We consider three categories of policy goals on
assignments and identify when the mechanisms can achieve them. By introducing a
novel framework of interdistrict school choice, we provide a new avenue of
research in market design.
