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Za rod ''Edmontosaurus'' se trenutno smatra da sadrži tri validne vrste: tipičnu vrstu ''E. regalis'', ''E. annectens'' i ''E. saskatchewanensis''.<ref name=HWF04/><ref name=WH90/> ''E. regalis'' je pronađen u formacijama Horseshoe Canyon, St. Mary River, i Scollard u Alberti, u formaciji Hell Creek u Montani, Sjevernoj Dakoti i Južnoj Dakoti, u formaciji Lance u Južnoj Dakoti i Wyomingu i u formaciji Laramie u Coloradu; potiču iz vremena kasne krede. Poznato je barem dvanaest primjeraka, uključujući sedam lubanja sa postkranijalnim skeletom i pet do sedam drugih lubanja. ''Trachodon atavus'' i ''Agathaumas milo'' su potencijalnii sinonimi.<ref name=HWF04/><ref name=WH90/>
''E. annectens'' wasje listedu innajnovijem thepregledu latestzapisan reviewkao asprisutan beingu present in theformacijama Scollard Formation of Alberta, the Hell Creek Formation of Montana and South Dakota, the Lance Formation of South Dakota and Wyoming, and thei Laramie Formation of Colorado. Ograničen Itje isna limitedkamenje tokasnog lateMaastrichtija Maastrichtiani rocks,poznat andje isod knownbarem from5 atlubanja least five skullssa withpostkranijalnim postcraniaskeletom.<ref name=HWF04/> OneJedan authorautor, Kraig Derstler, hasje describedopisao ''E. annectens'' askao "perhapsdinosaura theo mostkojem perfectly-knowndo dinosaurdanas tomožda datenajviše znamo [1994.]."<ref name=KD94>{{cite book |last=Derstler |first=Kraig |year=1994 |editor=Nelson, Gerald E. (ed.) |title=The Dinosaurs of Wyoming |series=Wyoming Geological Association Guidebook, 44th Annual Field Conference |chapter=Dinosaurs of the Lance Formation in eastern Wyoming |publisher=Wyoming Geological Association |pages=127–146}}</ref> ''Thespesius edmontoni'' orili ''edmontonensis'', ''Anatosaurus copei'', andi ''Trachodon longiceps'' weresu allsmatrani regarded as synonyms ofsinonimima ''E. annectens'' inu ajednom pregledu iz 2004. reviewgodine.<ref name=HWF04/> ''T. edmontoni'' hasje usuallyzapravo beenpriključen assigned tovrsti ''E. annectens'' sinceveć od 1990,<ref name=WH90/> althoughiako thesinonimizaciju ''A. copei'' andi ''T. longiceps'' synonymizations have not yetjoš beenuvijek testednisu bytestirali otherdrugi authorsautori. Ako Ifdokažu theyda provepripada to belong tovrsti ''E. annectens'', itsnjegov totalukupni wouldbroj increaseprimjeraka bypovećat theće fivese individualsza assigned5 toprimjeraka koji se priključuju ''A. copei''<ref name=RCMBS90/> andi theza lowerdonju jawčeljust thatkoja isje theholotipni holotype ofprimjerak ''T. longiceps'' (the numberbroj givendat forza ''E. annectens'' inu Horner ''et al.'' [2004.] isje incorrectnetočan, asbudući itda isnije unchanged fromdrugačiji anod earlierranije publicationobjave<ref name=WH90/> thatu didkojoj not considerse ''A. copei'' andi ''T. longiceps'' synonymsnisu ofsmatrali sinonimima ''E. annectens''). ThePopis listformacija ofmožda formationsje maynetočan, beovisno ino error,formaciji depending on theiz formationkoje thatdolazi ''T. edmontoni'' comes from (itnije isnavedeno notiz statedkojeg whichdijela part of thestare oldformacije Edmonton Formationje itprimjerak came fromdošao). ''T. edmontoni'' mayje bemožda misassignedbio priključen krivoj vrsti; James Hopson inje 1975. proposedgodine thatpredložio itda wasje ato mladi primjerak youngvrste ''E. regalis'',<ref name=JAH75/> anda Nicolas Campione alsoje foundtakođer thatzaključio itsda skullse wasnjegova indistinguishablelubanja fromnije therazlikovala contemporaryod ''E. regalis'' inu aistraživanju preliminaryiz 2009. studygodine.<ref name=campione2009>Campione, N.E. (2009). "Cranial variation in ''Edmontosaurus'' (Hadrosauridae) from the Late Cretaceous of North America." ''North American Paleontological Convention (NAPC 2009): Abstracts'', p. 95a. [http://www.google.com/url?sa=t&source=web&cd=2&ved=0CCAQFjAB&url=http%3A%2F%2Fnapc2009.org%2Fwp-content%2Fuploads%2F2009%2F06%2Fnapc-2009-abstracts-cinc-mus-ctr-sci-cont-3.pdf&ei=p5y1TcXdOYLTgQfh88itDQ&usg=AFQjCNGSQUbrH6HnjHQKs0ki76RUhdLQDA&sig2=i709LeLWA7-VpjwwqehJIw PDF link]</ref> ''E. annectens'' differedse fromrazlikovao od ''E. regalis'' by having a longerdužom, lower,nižom lessi robustsitnijom skulllubanjom.<ref name=DFG97/> AlthoughIako je Brett-Surman regardedsmatrao ''E. regalis'' andi ''E. annectens'' askao potentiallypotencijalne representingmužjake malesi andženke femalesiste of the same speciesvrste,<ref name=MKBS89/> allali primjerci ''E. regalis'' specimenssu comepronađeni fromu olderstarijim formationsformacijama thanod primjeraka ''E. annectens'' specimens.<ref name=campione2009/>
''E. saskatchewanensis'' isje knownpoznat fromod fourpet or five individualsjedinki, mostly represented byvećinom skullslubanja. Nađen Itje hassamo onlyu been found in the late Maastrichtian-ageformaciji Frenchman Formation ofu SaskatchewanSaskatchewanu.<ref name=HWF04/> ItRazlikuje differsse fromod thedruge otherdvije twovrste speciespo inmanjoj its smaller sizeveličini.<ref name=CMS26/><ref name=DFG97/> ThereMalo hasse beenpisalo littleo publishedovoj onvrsti thisotkada speciesje since its descriptionopisana, inu comparisonodnosu tona thedruge other two speciesdvije. Preliminary work by Nicolas Campione haveRadovi shownNicolasa thatCampionea itsu ispokazali probablyda aje synonymvjerojatno ofsinonim ''E. annectens'', thoughali morepotrebno studyje isviše requiredistraživanja.<ref name=campione2009/>
Additionally, there are many ''Edmontosaurus'' fossils that have not been identified to species. Remains that have not been assigned to a particular species (identified as ''E.'' sp.) may extend the range of the genus as far as the [[Prince Creek Formation]] of [[Alaska]]<ref name=bbdb07>{{cite web|url=http://www.press.uchicago.edu/books/rogers/bonebeds_chapter2_appendix.xls|title=Evolution of Terrestrial Ecosystems Bonebed Database|last=Behrensmeyer|first=Anna K.|year=2007|work=Bonebeds: Genesis, Analysis, and Paleobiological Significance|publisher=University of Chicago Press|accessdate=2008-12-07|format=Excel spreadsheet}}</ref> and the [[Javelina Formation]] of [[Texas]].<ref name=DBWetal04>{{cite book |last=Weishampel |first=David B. |authorlink=David B. Weishampel |coauthors=Barrett, Paul M.; Coria, Rodolfo A.; Le Loueff, Jean; Xu Xing; Zhao Xijin; Sahni, Ashok; Gomani, Elizabeth M.P.; and Noto, Christopher N. |editor=Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.)|title=The Dinosauria |edition=2nd |year= 2004|publisher=University of California Press |location=Berkeley |isbn=0-520-24209-2 |pages=517–606 |chapter=Dinosaur distribution }}</ref>
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