Using recently released Census estimates for 2019, lehighvalleylive.com analyzed the Lehigh Valley’s makeup by ZIP code and created a map that shows the senior populations and median age of each.

Click on the map to see radon levels in each Lehigh Valley ZIP code. The EPA’s action level for radon, the point where mitigation steps should be taken, is 4 picocuries per liter. A curie is a ...