Local government participation (i.e., accommodating data sharing policies) in regional, statewide, and nationwide spatial data infrastructures can be more challenging than the technology and standards required to implement it. In Indiana, the approach has been to make a formal request for participation. At just about 6 months old, today Indiana reached the half-way mark with gaining voluntary local participation (46 of 92 counties). The participation agreement includes public domain access to the following: address points, parcel boundaries with parcel identification numbers, road centerlines, and political boundaries. Access will be provided through the IndianaMap, and thus available to The National Map and surrounding states. Technical implementation has been successfully piloted with the IndianaMap Address integration Pilot Project (supported by a USGS grant) and full implementation is under development.