See above. Also, I think that the public has some access to the Georgetown SO range, but double check that.
Now, since you are new, let me help you out. Conway is not “the northern part of the state”, even though it’s at the top. Generally, it’s considered the “eastern” part of the state, or just “the coast.”
“The northern (western) part of the state”, also called the “upstate” generally refers to Oconee, Pickens, Greenville, Spartanburg, and a few others in that general area.
I know. I know. Horry is one of the northernmost counties. But, SC is divided into three geographic regions: “The Coastal Plains”, “The Piedmont”, and the “Blue Ridge” or “Upstate.” The beach isn’t usually referred to as northern.
Now, I may be reading this wrong. If you mean the people who live there, then yes, Horry is definitely northern.

In any case, welcome.