Tuxpan, is both a municipality and a municipal seat in the Mexican state of Nayarit, being the smallest municipality in Nayarit. It is located in the …Tuxpan, is both a municipality and a municipal seat in the Mexican state of Nayarit, being the smallest municipality in Nayarit. It is located in the west of the state and has boundaries with the municipalities of Rosamorada in the north, Santiago Ixcuintla in the south and west, and Ruiz in the east.