How many US cities print the 1 dollar bill?

There are currently 2 facilities where US bills are printed. The original facility is in Washington and a secondary plant is in Fort Worth. All denominations, not just $1 bills, are printed at each facility.

The Fort Worth plant opened in December 1990. Bills printed there can be identified by a tiny "FW" next to the plate number in one corner of the design, for example FWC36