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geonames.usgs.gov/pls/gnispublic/f?p=gnispq:3:::NO::P3_FID:1804540
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www.findagrave.com/cgi-bin/fg.cgi?page=csr&CScnty=3364 (13 Sep 2009)
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www.linkpendium.com/genealogy/USA/PR/Rio_GrandePR/ (30 Dec 2012)
Río Grande Municipio, Puerto Rico: Bibles, biographies, cemeteries, census, genealogy, newspapers, obituaries, vitals: births, marriages, deaths.
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www.gobierno.pr/GPRPortal/StandAlone/MunicipalityInformation.aspx?Filter=36 (10 Aug 2010)
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en.wikipedia.org/wiki/Río_Grande,_Puerto_Rico (29 Jul 2010)
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factfinder.census.gov/servlet/GCTTable?_bm=y&-geo_id=05000US72119&-_box_head_nbr=GCT-PH1&-ds_name=DEC_2000_SF1_U&-redoLog=false&-format=CO-2&-mt_name=DEC_2000_SF1_U_GCTPH1_CO2 (9 Nov 2012)
American FactFinder (AFF) -- Geographic Comparison Tables with subjects: Area Measurement & Population Density for Río Grande Municipio, Puerto Rico by County Subdivision and Place in Census dataset Census 2000 Summary File 1 (SF 1) 100-Percent Data