Chum Saeng is a district (amphoe) in Nakhon Sawan Province, upper central Thailand. It is an old district of Nakhon Sawan. Neighbouring districts are (from the north clockwise): Pho Thale and Bang Mun Nak of Phichit Province, Nong Bua, Tha Tako, Mueang Nakhon Sawan and Kao Liao of Nakhon Sawan Province.
The government separated some parts of Mueang Nakhon Sawan District to establish Tambon Koei Chai. In 1903, the Interior ministry upgraded the tambon to be Phan Lan District, named after the central tambon. A few years later, the name was changed back to Koei Chai. The district office was moved to the west bank of the Nan River and renamed to Chum Saeng in 1915.
The name Chum Saeng in Thai is the name of a herb tree that look like Chaeng trees (Maerua siamensis (Kurz) Pax.). Another possible origin of the name may date back the reign of King Taksin, when in the area was a weapons warehouse, named Khlang Saeng in Thai. Chum Saeng's ethnic group are Tai Dam people. At present, they live in Ban Phai Sing, Phai Sing Sub-district.
Chum Saeng during the reign of King Rama V was considered a community of Thai-Chinese and was the centre of the rice trade by water. Because it lies at the confluence of the two rivers Nan and Yom and the northern railway line runs through it, Chum Saeng as a very active place in the 1960s–70s. Moreover in those days, it was filled with gold shops. Then people prefered to use train as the main means of travel, but after more roads were built, water and train travel is reduced, thus making this district less important over time.
Chum Saeng is about 39 km (24 mi) from Mueang Nakhon Sawan. The district is divided into 12 sub-districts (tambons), which are further subdivided into 131 villages (mubans). Chum Saeng is a town (thesaban mueang) covering tambon Chum Saeng. Thap Krit is a township (thesaban tambon) covering parts of the same-named tambon. There are a further 11 tambon administrative organizations (TAO).

Source: Wikipedia