Statistics are reported annually to the Church of the Nazarene General Board. These reports include comparisons with the previous year and the previous decade.
From the 2016 report:
There are currently 30,574 churches in the denomination (22,392 considered officially organized).
The Church of the Nazarene has 17,848 ordained elders, 820 ordained deacons, and 10,006 licensed ministers.
Information is based on reporting received from districts for assemblies held October 1, 2015, through September 30, 2016.