There are 86 Air National Guard stations in addition to the AF bases.
Source is the web site http://www.globalsecurity.org/military/facility/afb.htm.
This is a very interesting site, as it gives details, pictures, history and the current status of all these bases. It also lists all the international bases in other countries.
P.S.
OH, this does not include Area 51, but considering that it doesn't exist and if it did, we wouldn't know what branch of the military it belonged to, even though the major emphasis of 'things' coming out of area 51 seem to be aircraft, you would think Air Force, so it obviously isn't counted in this number.