The 2011 County Health Rankings is described by its authors as the most comprehensive report of its kind to rank the overall health of nearly every county in all 50 states.
"The County Health Rankings provide an interesting snapshot of the health of people in the counties we serve," said Cindy Trail, deputy director of the Central District Health Department, which serves Ada, Boise, Elmore and Valley counties.
Ada County came in fifth of the 42 Idaho counties ranked, though Ada came in last when it came to its physical environment, primarily because of unhealthy air quality and a perceived lack of recreational facilities.
According to this year's rankings, the five healthiest counties in Idaho are Madison, Latah, Franklin, Blaine and Ada. Poorest health, starting with least healthy were: Lewis, Shoshone, Butte, Gooding and Payette.
"We view the findings as broad measures of health issues and we use them to help map strategies for improving the health of people in our counties," said Trail.