Not-for-profit financial cooperative serving Southern and Northeastern Wisconsin, plus Lake and McHenry Counties in Illinois. Landmark Credit Union serves all people living or working in Southern and Northeastern Wisconsin, plus Lake and McHenry Counties in Illinois as well as their immediate family members. Immediate family is defined as spouse, child, parent, grandparent, or grandchild. This includes stepparents, stepchildren, and adoptive relationships. Landmark also serves businesses with a location in Southern and Northeastern Wisconsin, plus Lake and McHenry Counties in Illinois.