On the one hand, the small "community" of rural settings led to relatives joining the "regiment" that was formed and had a recruiting office/officer or drive in that area.
But there are exceptions.
In this are, already as early as 1862, the "recruiting drives" were falling short so their efforts were extended to take in three, four, or five neighboring counties rather than just "one."
And, I have noticed that with the twenty-some relatives in Federal service, that even
brothers and uncles who lived in the same community did not always enlist in the "local" regiment. Even tohugh the World was often "smaller," and folks did not always travel that far from 'home," she has farmer ancestors who lived in say Marietta, Ohio but who enlisted
in regiments in Zanesville or even as "far away" as Cincinnati.
In gleichem Schritt und Tritt, Curt Schmidt
Not a real Civil War reenactor, I only portray one on boards and fora.
I do not portray a Civil War soldier, I merely interpret one.