The present revision of the nuclear structure properties for the nuclides belonging to the A = 191 mass chain contains many improvements, corrections and additions to the material presented in previous evaluations (1995Br38, Nucl. Data Sheets 74, 611 (1995)). Besides updating many values, and including supplementary data for already known levels, transitions and level schemes, the most noteworthy modifications with respect to the prior evaluation are the first significant level schemes for ¹⁹¹Pb, ¹⁹¹Bi, and ¹⁹¹Po, showing many levels and transitions, mostly derived from (HI,xnγ) work. The first reports for ¹⁹¹At and ¹⁹¹W and the observation of linking transitions from superdeformed levels to normal deformed levels in ¹⁹¹Hg were also included. Most of decay data sets contain many discrepant data; in some cases, normalization is tentative.