The locations of each of the 24 GeoGuessr puzzles form 12 pairs that co-exist along the same Interstate or US Highway. Following these routes from point to point, the city exactly halfway in between is a namesake for a historical US executive officer—including some that no longer formally exist (Secretary of War, Postmaster General). The namesakes of the cities correspond to the first names in the list on the side, ordered alphabetically by last name.

Among these 12 officers, there exist 6 pairs that shared the same office with each other. These pairs also share identical location-to-location distances geographically. From these 6 pairs, identify the person who served in that office halfway between each pair member ordinally (i.e. Presidents James Madison (4th) and John Tyler (10th) give Andrew Jackson (7th)).

Extract the middle letter of the last names of these in-between officers (they all have an odd number of letters). Order by increasing location-to-location distance to obtain the answer, MEDIAN.

To aid extraction, the locations are ordered as symmetric tetrads; [1] and [24] are same-road pairs (with the one farther west as the lower number), which pair with [2] and [23] to form same-office pairs. The pair-distances are smallest in the ends of the list (1, 2, 23, 24) and grow inwards, such that the answer can be read from outside-in.

In addition, here is a guide to solving each of these locations; they typically involve finding an exit sign or a local business sign, which can be Google searched to attain the original location. No location requires venturing more than a handful of clicks (other than for enjoying the landscape).