Centers for Disease Control and Prevention

Every year the CDC calls tens of thousands of Americans and asks about their health habits and conditions. Do you smoke? How often do you exercise? Do you have diabetes or high blood pressure? This data shows what percentage of people in each state answer yes to these questions, broken down by age, race, income, and other groups. It's how the government tracks whether Americans are getting healthier or less healthy, and which states are doing better or worse. The numbers come with confidence intervals, so you can see how reliable each estimate is based on how many people were surveyed.

Diabetes rates in your neighborhood. Depression. Obesity. Smoking. People without health insurance. This dataset maps 40 health measures down to the census tract level, so you can see how health varies block by block across the country. The numbers come from statistical models rather than surveys of your specific tract, which is why CDC warns against using them to judge local health programs. But they're useful for spotting patterns and comparing neighborhoods.

This is how the CDC tracks disease outbreaks week by week across America. Say measles cases spike in one state this week, or pertussis is spreading in multiple regions. This dataset shows you exactly where cases are being reported, how many there are this week, how many have accumulated so far this year, and whether things are worse than they were at their peak in the last year. It covers about 60 diseases that doctors are required to report. Updated every week, so you can spot trends as they happen.

Health conditions and behaviors don't spread evenly across the country. This dataset breaks down 40 different health measures by county: things like diabetes rates, smoking, depression, whether people get cancer screenings, and access to dental care. The CDC didn't survey every county directly. Instead, they built a model using national survey data, census information, and local demographics to estimate what the rates probably are in each place. For each measure, you get the estimated percentage of adults dealing with it, plus a confidence range showing how certain that estimate is. Counties with fewer than 50 adults don't get estimates. You can see how your county compares on any of these 40 health measures.

Wondering how many kids in your state are vaccinated against measles, polio, or other diseases? This is where that data comes from. The CDC regularly surveys vaccination records to see what percentage of children have received each vaccine. You can see coverage rates by state, by age group, and by vaccine type. It's the primary way public health officials know whether immunization programs are working or if there are neighborhoods falling behind.

Track drug overdose deaths month by month in every US county. This is provisional data, meaning CDC updates it regularly as more toxicology results come in and preliminary numbers get confirmed. You can see which counties are hardest hit and whether the crisis is getting worse or better. Small counts (1-9 deaths) are hidden to keep individual cases private. This is the closest thing to real-time overdose data available, though there's always a lag while deaths are investigated.