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RoadMainstreet Credit Union is a not-for-profit cooperative financial institution formed to provide services to the individuals who join it - its members.

Originally known as the Northeast Johnson County Teachers' Credit Union, Mainstreet was chartered in 1953 by a small group of teachers. Volunteers conducted business from a classroom in the Shawnee Mission School District, with initial deposits totaling less than $65. In 1961, the first manager and two part-time employees were hired. Throughout the years, many more school employees within the county became interested and the name was changed to Johnson County Teachers' Credit Union (JCTCU) in 1962. Also that year, the Credit Union moved from school property into a rented office.

As smaller credit unions in the area began to dissolve, JCTCU revised its charter and absorbed them, boosting an already increasing membership. By 1977, the Credit Union had offices in three cities: Mission, Olathe, and Overland Park. The charter was changed in 1979 to open the field of membership to anyone living, working or paid by a company in the county. As a result, JCTCU became the Credit Union of Johnson County (CUJC).

In 2005, CUJC's charter was changed to include the entire Kansas City Metropolitan Area. This area is made up of the following counties in Kansas: Leavenworth, Wyandotte, Johnson, Douglas, Miami, Franklin and Linn; and the following counties in Missouri: Platte, Clinton, Caldwell, Clay, Ray, Jackson, Lafayette, Cass and Bates.

CUJC’s membership and assets continued to grow, and in 2008 it reached a milestone by opening two branches outside of Johnson County.  Located in Lawrence, they were acquired through a merger with Free State Credit Union.  Mergers in 2009 with Leavenworth Teachers' and Community Credit Union and Faith Financial Federal Credit Union, now known as Barry Trail in Kansas City, Missouri resulted in additional branches in those locations. Thus,  CUJC’s increasing presence outside of Johnson County heightened the need for a new name to better define our service area and purpose. After much research and collaboration, the new name, Mainstreet Credit Union, became public in February of 2010. 

Later that same year a merger with Wyandotte Credit Union was completed, resulting in a full-service branch in Kansas City, Kansas, and another merger with Bonner Springs Federal Credit Union produced the latest location in the historic downtown of Bonner Springs. Now, more than 60,000 members from a variety of companies, agencies, professions and neighborhoods find our unique financial services beneficial. Mainstreet is operated by people who live where you live, striving to guide members along an informed and rewarding financial journey.