Today, the city with the most number of yatai is said to be Fukuoka, with 111 stalls, most of them located in Nakasu and Tenjin. Due to their popularity, the number could probably have been much higher, but the yatai business is strictly regulated by law.
EXIF info:
Nikon Df
Lens: 24-70mm F/2.8G
Focal Length: 24mm
Aperture: F/9
Shutter Speed: 1/60s
ISO Sensitivity: ISO 4000