| nps.gov | Pennsylvania Avenue National Historic Park |
| h-net.org | H-DC, Washington, D.C. History Network |
| dcwatch.com | Flag of the District of Columbia |
| citymuseumdc.org | The City Museum |
| dcpages.com | Origins of the Name District of Columbia |
| dclibrary.org | District of Columbia Public Library: Washingtoniana Division |
| gwu.edu | George Washington University: Gelman Library Special Collections |
| exploredc.org | Exploredc |
| washington.dc.us | History of Self-Government in the District of Columbia |
| landmarks.org | Landmarks Preservation Council of Illinois |
United States , New Jersey , Mount Laurel