Four counties in Alabama have more registered and active voters than the number of voting-age adults in the county. An active voter means the person has voted within the last four years.
As of March, Greene, Hale, Lowndes and Macon counties had more active, registered voters than what the census estimated as their 18-and-older population in 2012.
Active voters are those who have not been placed on inactive status. That happens when the periodic update cards from county boards are returned as undeliverable, or if they don’t vote for four years (two federal election cycles).
Each county has a three-person team that is supposed to ensure the integrity of the voter rolls—e.g. removing names when a person has died or moved out of the county. The discrepancy is being explained as "under-counting" by the U.S. Census, as some people are hesitant to talk to a census worker. Other names may be duplicates.
All four counties voted heavily for President Obama in the 2012 election. Alabama's new voter identification law goes into effect for the June 3 primary. This appeared here.