the reason its not part of the csa right now is because theres just nothing between the two except highways. you have ridgeland and hardee ville and other small communities, but its all still fairly undeveloped. their is a strong connection between the two, transportation and buissness wise, and i think in the nex 10 - 15 years it will officially be one csa at that point, with jasper and liberty counties, and possibly effingham as well added to the msa. add those and even right now and you'd have an msa of approx. 465,000. now i dont know if we could add liberty because of the hinesville msa so without that it would still be about 400,000. now say you had about a 7% increase in population.(totally theoretical) with hinesville that'd be alost half a million.
that was all estimation but it gives you the basic idea.