Barangay Sinait is the one of the West District Division of Barangay in Tarlac City. Barangay Sto. Niño and Barangay Sta. Maria bound it in the North, Barangay Baras-Baras on the West, Dolores and San Isidro on the South, Sta. Cruz on the Southeast and Aguso on the East.

It is approximately 6.0 kilometers away from city proper. It has a total land area of 423.73 hectares divided into agricultural and residential area. 110.7 hectares designate to agricultural area and 313.03 hectares corresponds to residential and other area.

It divided into 7 Blocks namely: namely Block 1, Block 2, and Block 3 to Block 7.

Barangay Sinait classified as Rural Barangay, it has a total population of two thousand one hundred sixty two (2,162) as of 2005, and a household population of four hundred thirty-one (431).

Barangay Sinait is also an agricultural barangay. Approximately 70% of the total populace in this area provides their daily needs through farming. They cultivate palay, corn and vegetables vice versa depending on the season of planting. Poultry rising and piggery are also their sources of livelihood. The rest of the populace was professional, OFW’s, laborer, employee, construction workers, drivers, and so on. The others have their own mini business such as sari-sari and so on.

Early 1900’s during the Spanish regime this place was full of tall grasses, and big trees. At that time, the population residing in this area is small in number. As years goes by, the population increases because of the different migrants came from neighboring Provinces such as Ilocos and other Provinces. Mostly residents here came from Sinait, Ilocos Sur. They also called Ilocano and because of that resident of this place decided to name their barangay as Sinait because most residents came from Sinait Ilocos Sur.

Ninety percent of the total populations are Pampango, and the rest are Tagalog, Bisaya, Pangasinense, and Ilocano.

Barangay Sinait celebrates their feast day every April 23 as a thanksgiving to the patron Saint Nuestra Señora (Birhen Dolorosa).