Herman Hollerith

Historical marker location:

1054 31st Street Northwest, Georgetown, District of Columbia

( Marker is at the intersection of 31st Street Northwest and C&O Canal Towpath Northwest, on the right when traveling south on 31st Street Northwest.)

Marker installed: 1984

Tabulating Machine

The city was built on a swamp: The area that is now Washington, D.C. was originally a swampy, marshy region along the Potomac River. The construction of the city involved extensive drainage and landfill projects to make the land suitable for building.