Professor Matthew Pavesich, Georgetown University, collects and curates a database of DC flag adaptations, their locations, and characteristics. More information about his work relating to the DC flag be found on his site dc/adapters.  

I am developing this map with him to show how the data can be visualized in various ways. In the future, there will be a filter function added to display data by tags. A direct link to the map can be accessed here.

The map was created using Leaflet.js and importing the data in geojson format.