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Early Republic

Southeast Number 5 Boundary Marker

Prince George's County, Prince George's County, Maryland

Marker Inscription

Jurisdiction of the United States Miles 5

The Story

This weathered sandstone post is one of the original boundary stones that marked the ten-mile-square District of Columbia, set out beginning in 1791 to define the young nation's new federal capital. Surveyor Andrew Ellicott and free Black astronomer Benjamin Banneker laid out the perfect diamond straddling the Potomac, and every mile a stone like this was planted, its faces carved to name the jurisdiction and the mile count from the starting corner at Jones Point. As the marker on the district's southeast leg, 'Miles 5' recorded the distance walked along the line, a small monument to one of America's earliest great feats of public surveying.

Why it matters

These boundary stones are the oldest federal monuments in the country, physically fixing the ground on which the capital of the United States would rise. They stand as tangible witnesses to the deliberate act of creating a national seat of government from surveyed wilderness.

The story behind this marker

AI context

The era

In the early 1790s the United States was a brand-new nation still deciding, quite literally, where it would sit. The Constitution had authorized a federal district — a seat of government that would belong to no single state — and in 1790 Congress agreed to carve one out along the Potomac. What that meant on the ground was raw country: farmland, woods, and river marsh that had to be measured, marked, and turned into a capital.

The stretch of Prince George's County where this stone stands was, at that moment, the frontier of an idea. There was no city yet, no grand avenues, no dome — only a surveyor's line running through fields, and the promise that a national government would one day rise inside it.

This was the age of the compass, the chain, and the transit telescope, when defining a border meant walking it mile by mile under open sky. Fixing the exact edges of the new district was one of the young republic's first great acts of public work, and it was carried out with the tools and patience of the Early Republic.

People & events

The survey that produced this stone began in 1791 and ran into 1792, laying out a perfect ten-mile square that straddled the Potomac. The work was directed by Andrew Ellicott, a skilled and meticulous surveyor entrusted with translating a line on a map into markers in the earth.

Working alongside him in the early astronomical phase was Benjamin Banneker, a free Black astronomer and mathematician whose knowledge of the heavens helped establish the base points from which the boundary could be run. That a self-taught Black man of science stood at the founding measurement of the nation's capital is one of the quietly remarkable facts of this project.

The crews planted a stone at each mile along the boundary, its faces carved to record the jurisdiction and the distance walked from the starting corner at Jones Point. The face you can still read here notes the mile count on the district's southeast leg — a plain, practical inscription that was really a form of bookkeeping in stone, keeping honest track of how far the line had progressed.

Its place in the American story

These boundary stones are widely regarded as the oldest federal monuments in the country. They did something no document could: they physically fixed the ground on which the United States would build its capital, turning the abstract notion of a federal district into a shape you could walk around.

Every mile stone was a small assertion of national purpose — proof that a government still finding its feet could survey, define, and claim a seat for itself out of ordinary countryside. Long before the famous buildings existed, these humble posts were the capital's first permanent presence on the land.

That so many of them still stand, weathered but in place after more than two centuries, makes them rare survivors. They are among the earliest tangible marks the federal government ever left on American soil, and they remain right where the surveyors set them.

If you visit

Don't expect a grand monument — expect a modest, weathered post, easy to walk past if you don't know its story. That plainness is the point: you are looking at one of the first things the United States ever planted to mark its own capital.

Look closely at the worn faces and imagine the survey crew moving along the line more than two hundred years ago, planting a stone like this one at every mile. The lettering has softened with age, but the sense of a deliberate, counted journey is still there.

If you're piecing together a road trip through the Washington area, this makes a wonderful offbeat stop — a chance to trace the literal edge of the District rather than just its landmarks. Treat it gently and with respect; these old stones are fragile, and their value lies in standing exactly where the nation's first surveyors left them.

Written by AI to add context, grounded in the marker’s inscription and the historical record. The inscription above is the original, unaltered text.

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Related people

  • · Andrew Ellicott
  • · Benjamin Banneker

Related events

  • · Survey of the District of Columbia boundary (1791–1792)

Themes & tags

Westward ExpansionMonument

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