There are 78 municipalities in Puerto Rico.
Names from CIA World Factbook (http://www.cia.gov/cia/publications/factbook/geos/rq)
... housing units at an average density of 485.1/km² (1,260.4/mi²). The racial makeup of the town is 95.82% White, 0.50% African American, 0.04% Native American, ...