Jefferson Pier, Stone marker at National Mall, District of Columbia, United States
The Jefferson Pier is a three-foot-tall granite monument located west of the Washington Monument, featuring engraved longitude and latitude lines.
In 1804, President Thomas Jefferson commissioned this stone marker to establish an independent prime meridian for the newly formed United States.
The granite monument reflects early American scientific ambitions to establish independence from British standards of measurement and geographical reference points.
Visitors can locate the Jefferson Pier between the White House and Washington Monument by following the north-south path on the National Mall.
The inscriptions on the stone indicate its intended purpose as the center point of the District of Columbia, though part of this text was later removed.
Location: District of Columbia
Website: https://ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=UA0024
GPS coordinates: 38.88980,-77.03655
Latest update: May 12, 2025 08:32
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