County Health Rankings & Roadmaps, A Healthier Nation, County by County

The County Health Rankings models and measures

Our Approach

The County Health Rankings model of population health

What can I do?

Action Center

Explore guides and tools for improving health.

What Works for Health

Explore programs and policies that work!

What can I learn from others?


Key findings from the last four years of County Health Rankings and other national reports.

County-by-County Blog

Project updates, commentaries, events and news about health across the nation from the County Health Rankings & Roadmaps team.

Our Sources

There are many avenues to find evidence of effectiveness. This page highlights a number of web sites we consider in our review and assessment of evidence. To learn more about strategies that can work in your community, you may find it helpful to look at some of these sites along with What Works for Health. You may also choose to conduct your own evidence review.

Systematic Review Resources

Systematic reviews are considered the gold standard of evidence. These web sites provide systematic reviews for various content areas:

Rating Organizations

Many government and private organizations assess the effectiveness of policies and programs and assign evidence ratings. Organizations focus on a variety of topics; each has its own criteria to assess and rate evidence of effectiveness, and its own rating 'labels'. Examples include:

Published and Grey Literature  

Studies published in academic journals or through government or private entities can also provide information on evidence of effectiveness. Examples of organizations that produce relevant studies include: