Chachoengsao has a wide choice of street stalls and open markets to eat at. Along Chumpol Rd, Prampracha Rd and Soi 3 in particular there are a lot of reasonable street stalls. The central fresh produce market also has the usual noodle and rice vendors.
In the northern part of town, just over the bridge there is a pleasant open- to- the- street Thai restaurant whilst for those looking for air-con comfort, the restaurant on Chumpol Rd next to the Kasikorn Bank is just about your only choice.
Outside Wat Sothon there is a selection of good small Thai restaurants, all of which have tables overlooking the Bang Pakong River. This is one of the more pleasant places to eat in town.