See MS prevalence by region in the United States

See the incidence of Lyme disease across all 50 states in 2023

The US states with the highest rate of Lyme disease—meaning cases per 100,000 people—were Rhode Island, Vermont, and Maine, in 2023. Rhode Island had 260 cases per 100,000 people, based on cases reported to the US Centers for Disease Control and Prevention. (Some users may encounter a paywall.)

Alzheimer's is most prevalent in the South and the East

Risk factors for Alzheimer's can include age, race, education, and income levels, exposure to pollutants, and much more. As of 2023, these factors are seen in higher incidence rates for those above 65, in the southern and southeastern parts of the US.

MS risk is shaped by geography, not just genes

Latitude—and related vitamin D exposure—seems to affect MS risk. People who migrate from a high-risk MS latitude (like northern Europe or the northern US) to a lower-risk latitude (like tropical areas) before age 15 tend to adopt the lower risk of their new country—suggesting there's a critical window for environmental exposure.

Current US measles outbreak data from the CDC

This data portal from the Centers for Disease Control and Prevention tracks current cases, hospitalizations, and deaths from measles. A 2025 outbreak in Texas and New Mexico drove US cases to their highest levels since the early 1990s.

MS disproportionately sickens women, but men tend to have worse outcomes

Though the disease is more common in women, men's symptoms progress more quickly, with men more often diagnosed with progressive MS and men's cases typically resulting in more severe symptoms—perhaps due at least partly to more delayed diagnosis—and more severe disability over time.

81% of Florida's leprosy cases occur in central Florida, raising concerns

Researchers noted in 2023 that about one-fifth of new US leprosy cases were reported in the central part of the Sunshine State. What's more, about a third of the new US cases overall appear to have been acquired locally, raising questions about whether the disease is now naturally occurring in parts of the southeastern US.

CDC does not require docs to report hand, foot, and mouth cases which makes tracking difficult

Mid-Atlantic states saw a surge of hand, foot, and mouth disease in 2025 for as-yet unknown reasons. Virginia, Maryland, and New Jersey, reported elevated outbreak numbers in 2025 as compared to other recent years, but since the US Centers for Disease Control and Prevention does not require mandatory reporting of positive HFMD cases—unlike strictly notifiable diseases like measles—it's hard to truly know the extent of the outbreaks and how significant the caseload is as compared to prior years across the region or country.

Data indicates a strong concentration of religious people live in the American South

The Northeast and West Coast tend to be less religious. Mississippi is the most religious state, with 50% of adults classified as highly religious. Vermont is the least religious at 13%.

Poverty rates by US state

As of 2022, 37.9 million people in the US were living in poverty. But those people aren't evenly distributed among the 50 states. Some states and regions of the country are more impoverished than others. For instance, US poverty rates are relatively higher in the South than they are in the North. See the state-by-state breakdown with this map.

Winter-risk SAD is more likely in regions above 40 degrees latitude north

Using latitude, depression prevalence, and populations of women and those aged 18-30, this map shows the risk of experiencing seasonal affective disorder during the winter. Researchers weighted latitude most (50%) and demographics least (5% each for women and young adults). Overall risk is not a useful predictor of prognosis for an individual.

US macular degeneration burden is based on statistical modeling and Medicare claims

Prevalence estimates for age-related macular degeneration in the US are usually based on the Vision and Eye Health Surveillance System. Disease numbers are generated using Bayesian meta-regression (a type of statistical modeling), which pulls together information from multiple sources, including Medicare claims.

An interactive map of race and ethnicity across the US

This map by CNN shows race and ethnicity across the United States. America is more diverse and has more people than ever before. According to the 2020 census, much of its growth is occurring in and around metropolitan areas. By plotting the US...

See the polio cases that occur worldwide each year by region

Worldwide, the number of cases of polio reported each year from 1980 to 2024 has declined. This graphic depicts regional trends and declines by year.

European diseases killed a massive share of the Native American population

After Western contact, epidemic diseases devastated Indigenous communities. By 1920, the Native American population of the US had fallen to roughly 270,000, compared with an estimated 1.2 to 18 million at the time of European arrival.

Mapping hearing loss in the US

Nearly 10% of Americans suffer from some degree of hearing loss, measured as the inability to hear sounds lower than 25 decibels. The incidence of hearing loss increases with age and is typically higher among men. Recent analysis produced a puzzling observation researchers can't quite explain: There's a larger incidence of hearing loss among rural populations than in urban centers. Explore the data with this map and explainer.

Explore interactive global maps of cancer prevalence

Cancer is a ubiquitous disease, with populations across the globe having incidence rates that reflect various risk factors. The Cancer Atlas lets users explore a comprehensive global overview of cancer statistics, including incidence, mortality, prevalence, and survival rates across various regions and Human Development Index categories.

Find out how prevalent the flu is at this current moment

Updated weekly, this USAFacts resource shares current data from the CDC detailing how many cases of influenza and other flu-like illnesses accounted for doctor's visits. Monitor the spread of respiratory illness during flu season with this handy resource and prepare accordingly.

Snowfall records from every county in the US

Discover the one-day snowfall records of every county in the US in this comprehensive map. Data from the National Oceanic and Atmospheric Administration captures inches of snowfall and the year it fell the most in each county. See the contrasts between the inches of snowfall in warm southern American states and the cooler East Coast.

More than 5 million Americans have more than one autoimmune disease

Overall, about 4.6% of the US population—15 million people—have an autoimmune condition. Some common examples include rheumatoid arthritis, psoriasis, type 1 diabetes, Grave's disease, and autoimmune thyroiditis.

The US had about 155.4 million emergency room visits in 2022

Of those emergency incidents, the largest share of patients were between the ages of 25 and 44 and were in the southern part of the US. More than 43 million of the visits involved injuries, including poisonings.

View a map of America's regional pizza styles

It may all be pizza, but it's not all the same. From California to New York and from Quad City-style to Old Forge, this interactive map of the US lets you see the country's different takes on the classic dish.

35% of polled Americans said they'd view people differently if they knew they had a mental illness

In April 2025 polling, mental health remained highly stigmatized in the US. Though 88% of US adults say a mental health disorder is nothing to be ashamed about, 84% of them think the term "mental illness" carries a stigma and only about half of respondents said they'd feel comfortable sharing their mental health struggles with others.

3 US maps illustrate transplants, donors, and organ waitlist additions—by state

National UNOS tracking data feeds into these US maps that record all the transplants, donors, and waitlist additions in the last 12 months. California, for example, had the most transplantations in 2025—totaling about 5,200—but it also has the longest waiting list, with more than 20,000 additions in that same period.

Robins are a major host for West Nile in North America

Explore this interactive with key details and interesting facts about the disease, including that Culex genus mosquitoes are the main US vector for its spread, and that certain species—American crows and blue jays—are quite infectious with the disease, while American robins—despite being a significant host for the virus in North America—are less infectious.

This real-time tracking of the hantavirus cruise ship outbreak in May 2026 offers a unique glimpse into the global reach of the outbreak and whether the virus sickened passengers and their communities around the world.

Around 5 million of our 3 billion DNA letters differ between individuals

Genetic testing examines gene variants to help explain disease symptoms. It explores how genetic differences between individuals can be used to understand risks of developing diseases like Huntington's Disease or passing variants linked to disease onto offspring.

44% of Americans say they pray at least once a day—discover how your state's religiosity stacks up against the rest of the country.

Louisiana's 'Cancer Alley' is infamous for having some of the highest industrial pollution, toxic air emissions, and cancer risks in the US.

The United States is one of only around two dozen countries with a fully federal system of government, in which power is divided between national and state governments.

Explore an interactive map built from more than 100,000 survey responses on where people find joy in their lives

View the ten deadliest tornadoes in US history.

About 12.5% of US adults experience a phobia in their lifetime, a diagnosis that hinges on the intense fear interfering with daily life and persisting for at least six months.

The hormonal disorder PCOS was renamed PMOS in 2026, a move designed to improve care and research by shifting the focus to the hormonal causes of this condition that affects 1 in 8 women.

Fireworks-related ER visits are on the rise—in 2024, they increased by 52% as compared to the prior year.

Explore an interactive map of battles from the American Revolution, along with detailed summaries of each engagement

Between 10 million and 50 million people in the US develop rashes from poison ivy, poison sumac, and poison oak each year.

Alzheimer's can lead to brain shrinkage, with an average of around 2% of volume reduction per year

While El Niño moves warm Pacific Ocean waters east along the equator, La Niña moves them west, shifting where rainfall will become more common for months.

See how each of the more than two million known species relates to each other—and to common ancestors—in this zoomable tree of life.

Learn how monoclonal antibodies, which mimic the body's antibodies, can fight diseases like Ebola.

The American cockroach is actually from Africa, an apparent hitchhiker aboard ships carrying enslaved people, with evidence suggesting the bug may have arrived in the New World as early as the 1600s.

US consumers collectively owe more than $1T to credit card companies—almost as much as they owe in auto loans.

Visualize the path of every solar eclipse from 1900 to 2099 and see what each looks like when observed from different locations on Earth.

About 2,000 US babies are born annually without some portion of their limbs, potentially leading to a lifetime of pricey prosthetics.

The Great Salt Lake's distinct dual coloration results from high-salinity organisms that only live in the northern portion and produce a purple protein.

Search a massive database of over 4 decades of clues from the TV quiz show 'Jeopardy!'

The Russia-Ukraine conflict is the largest ground war in Europe since World War II in terms of casualties, forces mobilized, and displacement of civilians.

The Nasdaq's 'Magnificent 7' companies are responsible for roughly 40% of the Nasdaq 100 index's gains, while the remaining 93 companies account for the other 60%.

Some coin denominations have ridges etched on their sides, partly to prevent counterfeiting, in a practice called 'reeding.'

Astronauts have repaired genetic damage in space using CRISPR—a molecular tool that can make precise changes to DNA and is used in single-celled organisms to attack invasive viruses.