Which education savings plan can be used for K through 12 expenses as well post-secondary expenses?

The 529 Education Savings Plan can be used for K-12 and post-secondary educational expenses. While primarily known for college tuition, many states allow a portion of 529 plan funds to be used for K-12 tuition, fees, and other qualified expenses, such as books and supplies. However, the specific allowable K-12 expenses vary by state.