Mason-Dixon Map Sells for $950,000 at Auction
A hand-drawn 1768 survey of the historic border sold to an anonymous buyer after a three-minute bidding contest.
Updated on Nov. 3, 2026 in Geography
A hand-drawn map of the Mason-Dixon Line sold for $950,000 at Brunk Auctions in Asheville, North Carolina, on Thursday, October 29, 2026. Forty-five bidders competed for just under three minutes, and the price did not reach the auction house's $1.2 million high estimate.
Why it matters
The map documents a boundary that later carried national political weight, including its use in the 1820 Missouri Compromise. Its sale price reflects continued demand for rare historical cartography.
The map sold for $950,000 after 45 bidders competed for just under three minutes, starting from a $400,000 opening bid and falling short of the $1.2 million high estimate. The buyer asked to remain anonymous, and the buyer's plans for the map were not disclosed.
The players
Charles Mason
Charles Mason was an English astronomer who co-led the 1763 to 1767 survey that established the Mason-Dixon Line.
Jeremiah Dixon
Jeremiah Dixon was an English surveyor who co-led the Mason-Dixon survey with Charles Mason.
Brunk Auctions
Brunk Auctions is an auction house based in Asheville, North Carolina, that conducts both online and in-person sales.
Malcolm Forbes
Malcolm Forbes was an American publisher who purchased the Mason-Dixon map in 1982.
The details
Mason and Dixon finished the survey in 1768 to settle a border dispute between Maryland and Pennsylvania. The sale was held both online and in person at Brunk Auctions, and the Library of Congress was not among Thursday's bidders.
Timeline
1768: Charles Mason and Jeremiah Dixon finish the survey.
1820: The map is used in the Missouri Compromise.
1982: Malcolm Forbes buys the map for $360,000.
2002: The map is resold for $556,000.
Thursday, October 29, 2026: The map sells at auction for $950,000.
Historical Record
The map's documented use in the 1820 Missouri Compromise links this survey to one of the early federal disputes over slavery's expansion. The 1982 and 2002 sales show a pattern of rising prices for the map across two decades of resale.
Buyers and collectors of antique maps now have a recent benchmark for how a historic American boundary survey can sell at auction. The sale shows that original 18th-century surveys remain rare enough to command six-figure prices.
The takeaway
Historic documents tied to specific political episodes can hold value well beyond their cartographic function. The Mason-Dixon map shows how an 18th-century survey still carries financial and historical significance today.
Further reading
Explore more Geography coverage to see how historic boundaries like the Mason-Dixon Line shaped the nation's map.
Source note: This article includes information reported by The Dominion Post.
