Depression is one of the most common mental health conditions in the United States. About 8.3% of U.S. adults, roughly 21 million people, experienced a major depressive episode in 2021, according to federal survey data from the National Institute of Mental Health. Among adolescents, the numbers are even more striking: one in five teens had a major depressive episode that same year.
Depression Rates Among Adults
The 8.3% overall rate for adults represents people who met the clinical threshold for a major depressive episode within the past 12 months. That means experiencing symptoms like persistent sadness, loss of interest in activities, changes in sleep or appetite, difficulty concentrating, and fatigue for at least two weeks, severe enough to interfere with daily life. This figure captures only the most clearly defined form of depression. It doesn’t include people with milder but still disruptive depressive symptoms, so the true number of adults struggling with some form of depression is considerably higher.
When researchers ask a broader question, the numbers jump. A CDC analysis of self-reported lifetime depression diagnoses found that prevalence ranged from 12.7% in Hawaii to 27.5% in West Virginia. In other words, more than one in four adults in some states have been told by a healthcare provider at some point in their lives that they have depression.
Who Is Most Affected
Depression does not affect all groups equally. Women are significantly more likely to experience it than men: 10.3% of adult women had a major depressive episode in the past year compared to 6.2% of men. This gap holds across age groups and appears in adolescents as well, where it’s even wider.
Rates also vary by race and ethnicity. Adults identifying as two or more races had the highest prevalence at 13.9%. American Indian and Alaska Native adults followed at 11.2%, then white adults at 8.9%. Hispanic adults came in at 7.9%, Black adults at 6.7%, and Asian adults at 4.8%. These numbers likely reflect a mix of genuine differences in risk and uneven access to diagnosis. Communities with less access to mental health care may be underrepresented in surveys that rely on clinical definitions of depression.
Depression in Teenagers
The rates among adolescents aged 12 to 17 are far higher than in adults, and the gender gap is dramatic. Overall, 20.1% of teens experienced a major depressive episode in 2021. Nearly three in ten adolescent girls (29.2%) met the threshold, compared to 11.5% of boys. More recent data from SAMHSA covering 2022 through 2024 puts the annual average at 17.7%, suggesting some fluctuation but a persistently high baseline.
Among teen racial and ethnic groups, the pattern partly mirrors adults. Adolescents identifying as two or more races had the highest rate at 27.2%, followed by Hispanic teens at 22.2% and white teens at 20.7%. Black and Asian teens had lower reported rates, at 14.0% and 13.8% respectively.
Where Depression Is Most and Least Common
Geography plays a notable role. The states with the highest lifetime depression prevalence cluster in Appalachia and the South: West Virginia (27.5%), Kentucky (25.0%), Tennessee (24.4%), Arkansas (24.2%), and Vermont (24.2%). The lowest rates were in Hawaii (12.7%), California (13.9%), Florida (14.9%), Illinois (15.0%), and New Jersey (15.6%). The states with the highest rates tend to have higher poverty, fewer mental health providers per capita, and greater rates of chronic health conditions, all factors that both increase depression risk and make it harder to treat.
Half of People With Depression Get No Treatment
Perhaps the most consequential statistic is this: roughly half of Americans with depression receive no professional treatment at all. A UCLA Health analysis confirmed that about 50% of depressed adults go without care. The reasons are familiar: cost, lack of insurance coverage for mental health, shortage of therapists and psychiatrists (especially in rural areas), stigma, and the nature of depression itself, which saps the motivation to seek help.
This treatment gap means that the already large number of people living with depression understates the scale of the problem as a lived experience. Millions of people are dealing with symptoms that affect their relationships, their ability to work, and their physical health without any clinical support.
The Economic Cost
Depression carries a staggering financial burden. The total economic cost of major depression among U.S. adults reached $326.2 billion in 2018, a 38% increase from $236.6 billion in 2010. What’s striking is how that cost breaks down. Only about 35% comes from direct medical treatment. The majority, 61%, comes from workplace costs: missed workdays, reduced productivity while at work, and disability. The remaining 4% is attributed to suicide-related costs.
Workplace costs alone nearly doubled over that eight-year period, rising from $114.6 billion to $198.6 billion. Globally, the World Health Organization estimates that depression and anxiety together account for 12 billion lost workdays every year. Depression isn’t just a health issue. It’s one of the most expensive conditions affecting the U.S. workforce.
Depression in Older Adults
Depression in people over 65 is common but often underdiagnosed. Estimates vary widely depending on how depression is measured. One U.S. cohort study of adults over 71 found a prevalence of about 11%, while another study of adults over 65 put the figure closer to 25%. A global meta-analysis estimated the average prevalence of depression in older adults at roughly 32%, though that figure includes countries with very different healthcare systems.
Older adults face unique risk factors: chronic pain, loss of a spouse or close friends, reduced mobility, and social isolation. Depression in this age group is also more likely to be dismissed as a normal part of aging, both by patients and by the people around them, which contributes to lower rates of diagnosis and treatment.