It is currently represented by Ada García Montes and Migdalia González.
Senatorial district IV has an approximate population of 478,194.
[1] It covers the following municipalities: In previous distributions, the territory covered by senatorial district IV has changed.
In 1972 and 1983, the district included the municipalities of Lajas and Maricao.
[2] The district hasn't suffered changes in the recent redistributions of 2002 and 2011.