Hand shakeJoin Twin Oaks today! Membership is available to anyone who lives, works, worships, conducts business or attends school within Mason County, WV. A $25.00 deposit represents your ownership share in the credit union and is required in order to establish and maintain your account. Stop by today to be included in our field of membership. We want to make you a part of our family because once you become a member you will always be a member.