Depends on whether the category discussed includes broken or dead iPods (some posters have included them) or not.
I have three functioning iPods, one 64GB iTouch, (four years old) and one 80GB classic, (which is also over four years old but still going strong) both of which are used daily. The third is a brand new iPod classic, bought a little over a fortnight ago, and still in its wrapping, of 120GB, which is destined to replace one of the others when they shuffle off this mortal coil.
At home, an older 30GB iPod classic lies dormant, its demise having occurred over four years ago.
So, three working iPods, and one deceased iPod.