First Castle FCU – Your Banking Alternative First Castle Federal Credit Union was established in 1934 to first serve the US Army Corps New Orleans District, and we have continually grown through the years with our member base. We have recently won the charter to serve everyone who lives, worships, works, or volunteers in St. Tammany Parish. We are excited to be able to offer our banking products to all St. Tammany communities including: Madisonville, Mandeville, Covington, Folsom, Abita Springs, Lacombe, Slidell, Pearl River, and Sun.
