There are 7 US Post Offices in Colfax County serving a total of 13,570 residents equating to 1,939 residents per post office. It's estimated that approximately 21,659 packages are handled across the 7 county post offices annually. Colfax County is a county located in the U.S. state of New Mexico. As of the 2010 census, the population was 13,750. Its county seat is Raton. It is south from the Colorado state line. This county was named for Schuyler Colfax (1823-1885), seventeenth Vice President of the United States under U.S. President Ulysses S. Grant. Colfax County is the home of Philmont Scout Ranch."