| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| In the 1760s these 2 surveyors used milestones to mark the boundary line between Maryland & Pennsylvania | Mason & Dixon DD | $800 | DJ | AMERICAN HISTORY | 2006-10-06 | #5075 | |
| In 1763 these surveyors began work to settle a boundary dispute between the Penns & the Calverts | Mason & Dixon | $400 | DJ | U.S. HISTORY | 1990-02-20 | #1267 | |
| The 2 English astronomers for whom the famous boundary line between Penn. & Maryland was named | Mason & Dixon | $600 | DJ | U.S. HISTORY | 1988-01-18 | #781 |