How many federal district court judges are there in the united states?
No context provided
How many article III federal district court judges are there in the united states?
673
No context provided
How many federal district court judges are there in the united states in total?
678
United States federal judge
https://en.wikipedia.org/wiki/United%20States%20federal%20judge
 All of these judges described thus far are referred to sometimes as "Article III judges" because they exercise the judicial power vested in the judicial branch of the federal government by Article III of the U.S. Constitution. 
United States federal judge
There are a total of 678 federal district court judges in the United States. Of those, 673 are labelled as Article III judges, because they exercise the judicial power vested in the judicial branch of the federal government by Article III of the U.S. Constitution.