Castlewood, South Dakota — Castlewood is a city in Hamlin County, South Dakota. Founded in 1881 when the railroad was extended to that point, the town sits along the Big Sioux River. The area experiences a dry-winter humid continental climate with four distinct seasons and long, harsh winters.This page organizes FFL dealer listings associated with Castlewood, South Dakota within the directory’s location hierarchy. Visitors can keep browsing focused on the named place, move through its surrounding geography, and open individual listings for record-specific information. The page remains centered on the location itself while the catalogue can change independently. Use the hierarchy to return to broader place pages or continue toward a more specific community. Each step keeps the browsing path anchored to a named place and its surrounding geographic context.