The poll released Wednesday found support for recognizing same-sex marriage as legal has edged up two points since 2012 and is at its highest mark since Gallup began polling the question in 1996.
Younger Americans and Democrats are the most supportive of same-sex marriage, the poll found. 78 percent of those aged 18 to 29 said they support it along with 74 percent of Democrats.
Comparatively, 42 percent of people aged 65 and older and just 30 percent of Republicans said they support same-sex marriage. However, Republicans have nearly doubled their support since the firm began tracking the question.
The poll surveyed 1,028 adults by phone from May 8-11 and has a margin of error of 5 percentage points.