There are 78 municipalities in Puerto Rico.
Names from CIA World Factbook (http://www.cia.gov/cia/publications/factbook/geos/rq)
... to the United States Census Bureau, the town has a total area of 20.0 km² (7.7 mi²). 11.4 km² (4.4 mi²) of it is land and 8.6 ...