The Supreme Court enjoys greater support from liberals and moderates than from conservatives, the CNN/Opinion Research Corporation International poll said.
Fifty-three percent of liberals and 58 percent of moderates say the court is doing a good job while 37 percent of conservatives agree, the poll shows.
"That's probably a reaction to last year's decision on Barack Obama's healthcare law," said CNN Polling Director Keating Holland, referring to the Supreme Court's upholding of the Affordable Care Act last June.
"Before that ruling, most conservatives supported the Supreme Court, compared to only 44 percent of liberals. Now, most liberals approve of the court, with most conservatives saying they disapprove," Holland added.
The Supreme Court is set to release rulings on affirmative action, same-sex marriage and the Voting Rights Act, controversial issues that could change the court's approval rating yet again, CNN reported.
The poll was conducted nationwide June 11-13 with telephone interviews of 1,014 adults. The margin of error is 3 percentage points.