The below official site lists all test centers available when searching by town or zip code:
Find your closest test center :
Enter name of town (i.e. Bitburg, Wittlich) in the “Suchen”, or Search box at the top of the page”
Off-Base testing – Test centers are only to be used for asymptomatic testing.
If you experience symptoms please contact the Medical Group 06565-618333 or DSN: 452-8333.