John C. Bennett identifies seven plural wives married to Joseph by mid-1842.

Date: 1842
Type: Book
Source: John C. Bennett
Excommunicated
Critic
Hearsay: Direct
Reference: John C. Bennett, The History of the Saints; Or, an Exposé of Joe Smith and Mormonism (Boston: Leland & Whiting, 1842), 256
Scribe/Publisher: Leland and Whiting
People: John C. Bennett, Brigham Young, Elizabeth Davis Durfee, Louisa Beaman, Joseph Smith, Jr., Patty Bartlett Sessions, Joseph B. Noble, Presendia Lathrop Huntington Buell, Agnes Coolbrith Smith
Audience: Reading Public
Transcription: In concluding this subject, however, I will semi-state two or more cases, among the vast number, where Joe Smith was privately married to his spiritual wives — in the case of Mrs: A**** S**** [Agnes Coolbrith Smith], by Apostle Brigham Young; and in that of Miss L***** B***** [Louisa Beaman], by Elder Joseph Bates Noble. Then there are the cases of Mrs. B**** [Presendia Huntington Buell], Mrs. D***** [Elizabeth Davis Durfee], Mrs. S***** [Patty Bartlett Sessions], Mrs. G***** [unknown], Miss B***** [unknown], etc. etc.
Source Link: https://archive.org/details/historysaints00benngoog/page/n9/mode/2up
Citations in Mormonr Qnas: Polygamy (Joseph Smith Era)