The reference files listed below include the information collected during past Boundary and Annexation Survey (BAS) cycles. Select “Legal Boundary Change/Annexation Data” to view data tables by state featuring legal boundary changes that were reported each BAS year.

Select “New Incorporations, Mergers, Consolidations, and Disincorporations” to view data tables featuring governments that have been established, merged/consolidated, or ceased to exist in the past decade.