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An overlapped domain decomposition method (ODDM) combined with the combined field integral equation (CFIE) with impedance boundary condition (IBC) is investigated for efficiently analyzing electromagnetic scattering by 3-D imperfectly conducting objects. When solving each subdomain, only parts of the matrices need to be stored into memory. Hence, the storage in the proposed method is much smaller for an electrically large object than that in the method of moments (MoM). Since the spurious edge effect of the currents is effectively depressed by using the buffer region, the proposed method yields accurate radar-cross-section (RCS) results within a very few outer iterations.