Richwood, OH 43344 740-943-3054. Union County Health Department - Curbside pickup. Please call ahead. 940 London Avenue, Suite 1100 Marysville, OH 43040 937-642-2053. Lower Lights UnionStar Health Center - Lobby pickup. Please call ahead. 773 South Walnut Street Marysville, OH 43040 614-274-1455.