The article said between 500 and 1100, so... 800-ish. I know back in the 70's there were 66 bases in South Korea alone (tiny country). On cargo planes (I was a crew chief) the mission sometimes took you to secret bases in the Sahara desert only called 'Base X'. Who knows about how many of those there are.
BTW, congrats next door in La. (Houston here).
"Don't blame me, I voted for Kodos!"- Homer Simpson