There is such a huge range of data sources, it can be really hard to know where to start. Here are a few suggestions for good starting points. Look through the other tabs in this guide for more thorough lists of data sources in each area.
I'm looking for...
Data about people in the U.S., eg. race/ethnicity, income, national origin..
Start with US Census search from the U.S. Census. You can eventually move to other resources in the U.S. National Statistics tab.
National data about health in the U.S., including infectious diseases, substance abuse and violence:
State-level data about the health of the U.S. population:
Kaiser Foundation's State Health Facts
Available data categories are:
You can also check out the state's department of health for their data.
For city or local level data, you can start with that community's department of health.
New York City health data:
There are different data sets available. Look through the list for the one that fits your information need.