There are 78 municipalities in Puerto Rico.
Names from CIA World Factbook (http://www.cia.gov/cia/publications/factbook/geos/rq)
... States Census Bureau, the town has a total area of 5.9 km² (2.3 mi²). 5.4 km² (2.1 mi²) of it is land and 0.6 km² (0.2 mi²) of it is water. ...