The University of Connecticut said the more respondents earned in a year, the happier they are.
Seventy-one percent of respondents who earn $100,000 a year or more reported feeling either completely happy or very happy with their lives, while only 60 percent of those making $60,000 to $100,000 felt the same.
Only 49 percent of people making less than $60,000 reported feeling completely or very happy.
"We've all heard some variation of the phrase 'money can't buy happiness,' and while people are reluctant to say it's the most important thing in life, it clearly plays a role," poll Director Jennifer Necci Dineen said.
Other factors tied to personal wealth also impact one's happiness, the poll indicated. Sixty-eight percent of homeowners said they were happy with their lives, compared to 47 percent of renters, and 58 percent of people with jobs said they are happy, compared to 47 percent of unemployed.
The poll surveyed 1,006 randomly selected adults, who were interviewed by land line and cellular telephone between June 4 and June 11.
The margin of error was 3 percentage points.