CO457, CO458, CO459, and CO460 are the first corn (Zea mays L.) inbred lines released from the common rust (Puccinia sorghi Schwein.) resistance breeding program of Agriculture and Agri-Food Canada. All four inbreds possess extremely high levels of resistance, which is expressed in hybrids when these inbreds are combined with susceptible test lines. Acceptable grain yields and moistures are also achieved in some hybrid testcrosses. All four inbreds also possess intermediate resistance to eyespot [Aureobasidium zeae (Narita & Hirats.)].