Overview Hamilton Sales, Inc. is a local manufacturing representative firm handling sales, marketing and advancement of products in the field of commercial and residential plumbing products for the state of Louisiana and Mississippi. We have been in operation since April of 2002. Mission Hamilton Sales objective is to be able to promote our manufacturer’s products in a knowledgeable, professional manner paying attention to detail; recognizing and articulating the premier advantages our products have over our competitor’s to various markets all the while understanding that a favorable customer service experience is what matters most.