upcountry
Living or situated remote from the seacoast.
The fourth company involved in the purchase, the Upper Mississippi Company (formed by Thomas Scott after he had withdrawn the bid of the Virginia Yazoo Company), apparently restricted its largess to a few upcountry Georgians.
Where it comes from
Possibly a calque of French Pays d'en Haut, a designation from 1610 referring to the area of New France west of Montreal. By surface analysis, up + country.
Adapted from the Wiktionary entry upcountry (CC BY-SA 4.0).