Nearly one in 10 adults in the United States identifies as L.G.B.T.Q., according to a large analysis from Gallup released Thursday — almost triple the share since Gallup began counting in 2012, and up by two-thirds since 2020.

The increases have been driven by young people, and by bisexual women.

Nearly one-quarter of adults in Generation Z, defined by Gallup as those 18 to 27, identify as L.G.B.T.Q., according to the analysis, which included 14,000 adults across all of Gallup’s telephone surveys last year. More than half of these L.G.B.T.Q. young adults identify as bisexual.

Among all respondents, 1.3 percent identified as transgender, up from 0.6 percent in 2020. That is higher than other large surveys have found in recent years.

Members of Gen Z were most likely to be transgender, Gallup found — 4.1 percent were, compared with 1.7 percent of millennials and less than 1 percent in each older generation. Various groups have tried to count this population, and Gallup’s survey is considered one of the most complete.