MECU was established in 1940 by city employees looking for a way to earn higher rates on savings and lower rates for loans. Today, MECU has grown into a full service credit union. Membership in MECU is open to employees of the City of Lexington, employees of accepted outside agencies of the City of Lexington, employees of the Credit Union, and the family members of all eligible members. The Board defines family members as spouses, parents, step-parents, grandparents, children, stepchildren, foster children, brothers and sisters, step-siblings, half-siblings, brothers-in-law, sisters-in-law, aunts, uncles, nieces and nephews.