The Million Quasars (Milliquas) catalogue v6.3 is released with data
from publications to 15-June-2019, with the count of type-I quasars &
AGN up to 623,004. I'm including double radio-lobed galaxies now (as
class=G) because those lobes show an active galaxy nucleus of some
kind, even if well-hidden. There are 3581 of those, declared by the
algorithm which calculates them from FIRST, NVSS & SUMSS data. Most
of those identifications are not available anywhere else, I expect.

Milliquas is available on http://quasars.org/milliquas.htm. NASA
HEASARC has v6.2 at present, they'll put up v6.3 later at
https://heasarc.gsfc.nasa.gov/W3Brow...milliquas.html

Eric Flesch