Citadel Federal Credit Union is a privately owned financial cooperative headquartered in Exton, Pennsylvania, United States. Established in 1937 as the Lukens Employee Federal Credit Union by steelworkers in Coatesville, the member-owned, not-for-profit institution operates under a federal multiple common bond charter. The credit union provides retail and commercial banking services, including checking accounts, consumer lending, residential mortgages, and business financing, to individuals and corporate clients across the Greater Philadelphia region and surrounding mid-Atlantic states.