We constructed 480 inequivalent Hadamard matrices with Hall sets of order 28 in Kimura (1988) and Kimura and Ohmori (1987). These matrices were classified by K-matrices and K-boxes associated with Hadamard matrices. In this paper we introduce some order on subsets of equivalence classes. By choosing maximal or minimal elements of these subsets, we get a complete classification and obtain 486 inequivalent matrices of order 28 with Hall sets.