Back in August 2002, Ken Levy stated the following on the Universal Thread Message #689755:

This is a complex question, because there are many FoxPro developers world wide using various version of FoxPro. There are many still using FoxBase, many still using FoxPro 2.x, many still using VFP 3/5/6 but not VFP 7.0. The FoxPro commuity is only a fraction of that total since community means active and partipating members online, conferences, user groups, etc. People using some version of FoxPro is probably 200,000.

In April 2003, another estimate was made which you can see at http://www.leafe.com/archives/showmsg/132228 :

We don't know the exact amount of VFP developers, probably about 125,000 which includes all versions of FoxPro and VFP as well as people to did not obtain VFP legally. It appears about 10% of those people are active in the community in some way (mainly online or user groups and conferences).

http://fox.wikis.com/wc.dll?Wiki~HowManyWeAre~VFP

>Hi!
>
>How´s going on about the VFP Comunity size?? I´m very interested, it´s something that never cross my mind...