Members 1st Federal Credit Union is a member-owned, full-service, not-for-profit financial institution located in Central Pennsylvania. Established in 1950, the Mechanicsburg-based credit union has grown its current reach to eight counties that include Adams, Berks, Cumberland, Dauphin, Lancaster, Lebanon, Perry and York. The credit union prides itself on partnering with local community organizations and charitable events help make Central Pennsylvania a better place to live and do business.