Singair Upazila (Manikganj district) with an area of 217.38 sq km, is surrounded by Dhamrai and Manikganj Sadar upazilas on the north, Nawabganj (Dhaka) upazila on the south, Savar and Keranigonj upazilas on the east, Manikganj Sadar upazila on the west. 

Main Rivers are the Dhaleshwari, Ghazikhali and Kaliganga. 

Singair (Town) consists of one mouza. The area of the town is 8.31 sq km. The town has a population of 13567; male 50.62% and female 49.38%. 

Literacy rate among the town people is 29.9%. Administration Singair thana was established in 1919 and was turned into an upazila in 1983. It consists of 11 union parishads, 140 mouzas and 236 villages. 

Archaeological heritage Fort at Fordnagar, Neel-kuthi at Baira, Imampara Jami Mosque (Paril), tomb of Ibrahim Shah (Paril, Naohadda), Mosque near Paril Bazar (1904), residence of the Datta-Guptas, Ananda Kuthi and Mandir (Baldhara), Sen-bari and Durga-mandapa (Baldhara), Kali-sundari Charitable Dispensary (1895).

Historical events Having intelligence of the advance of the Pak army by boat from their camp at Singair towards the camp of the freedom fighters at Golaidanga High School on 28 October 1971, the freedom fighters took position on the bank of the Nurani Ganga Khal (canal). The Pak army sacked and raided the Golaidanga village and set on fire more than two hundred houses in four neighbouring villages. While returning to their Singair camp the Pak army was attacked by the freedom fighters on the Nurani Ganga Khal in which more than one hundred members of the Pak army including a Major were killed. Another battle was fought between the Pak army and the freedom fighters at Baira. The Pak army while carrying provisions from Manikganj to Singair on boats the freedom fighters launched an attack on their boats at Boira from both banks of the Dhaleshwari in which fifteen Pak soldiers were killed and one freedom fighter was wounded. Another battle was fought between the Pak army and the freedom fighters on 15 December at village Gazinda in which freedom fighters Md. Aminur Rahman, Chhakkeluddin, Shariful Islam and Rahizuddin of Gazinda were killed. 

Population 231628; male 50.47%, female 49.53%; Muslim 92.43%, Hindu 7.06%, Christian 0.02% and ethnic nationals 0.49% of the total population.

Religious institutions Mosque 396, temple 35, tomb 10, sacred place 1. 

Notable religious institutions: Imampara Jami Mosque, Upazila Parisad Jami Mosque, Irta Jami Mosque, Jaimandap Jami Mosque, Bhum-dakshin Jami Mosque (Dhalla), Shaorail Mandir, Maniknagar Vasudeva Mandir, Shayesta Kali Mandir, Baira Kali Mandir, Shayesta Taitha (Hindu sacred place), tombs of Ghazi Mulk Ekramul Ibrahim Shah (Paril), Rajab Shah (Paril), Zahir Bayati (Kaliakair), Piyar Pagla (Baira). 

Literacy and educational institutions Average literacy 21.05%; male 26.8%, female 15.3%. Educational institutions: college 2, high school 21, madrasa 6, primary school (government) 69, primary school (non-government) 18. 

Noted educational institutions: Jaimandap High School (1921), Jamirta MG Multilateral High School (1921), Singair Pilot High School (1940), Baira Multilateral High School (1940), Navagram Multilateral High School (1942), Charigram High School (1948), Shahrail High School (1964), Golaidanga High School (1967), Singair College (1968), Char Jamalpur Madrasa (1960). 

Newspapers and periodicals Weekly and periodicals: Dishari, Aloklata, Sheuli, Durbachal, Dawal, Ghazikhali, Chhaya-palli, Paril Bartabaha. 

Cultural organisations Club 50, public library 3, literary society 5, women's association 1, theatre group 5, theatre stage 1, cinema hall 1. 

Main occupations Agriculture 39.08%, agricultural labourer 26.6%, commerce 11.71%, service 7.56%, fishing 1.52%, wage labourer 2.99%, others 10.54%. 

Laud use Cultivable land 16194 hectares, fallow land 80 hectares; single crop 16.9%, double crop 71.37% and triple crop land 11.73%. Cultivable land under irrigation 51.5%. 

Land control Among the peasants, 23.06% are landless, 27.36% marginal, 27.43% small, 21.58% intermediate, 0.57% rich; cultivable land per head 0.07 hectare. 

Value of land The market value of the first grade arable land is Tk 12000 per 0.01 hectare. 

Main crops Paddy, wheat, jute, potato, pulse, oil seed, sugarcane, vegetable. Extinct or nearly extinct crops Onion, ground nut, arahar, dabri, barley, kaun, pea, sesame, maize, tobacco. 

Main fruits Mango, jackfruit, papaya, guava. Fisheries, dairies and poultries Fishery 175, dairy 140, poultry 190, hatchery 5. 

Communication facilities Roads: pucca 60 km and mud road 421 km; waterways 35 nautical mile. 

Traditional transport Palanquin (extinct) bullock cart and horse carriage (nearly extinct), boat. Manufactories Small industry 261.

Cottage industries Weaving 147, brass metal work 12, conch work 2, silk work 5, bidi factory 2, packaging 12, candle and agar work 18, welding 70, molasses production 10, book binding 14, wood work 72, bamboo work 287, goldsmith 52, blacksmith 48, potteries 143, tailoring 170. 

Hats bazars and fairs Hats and bazars are 31, fairs 12, noted of which are Sirajpur, Baira, Singair, Charigram, Jamsa, Shaorail Bazar, Natun Bazar, Baldhara Bazar, Maniknagar Bazar, Jaimandap Bazar, Bairagir Akhra Mela (Singair), Sadhu Asram Mela (Jamsa), Chaitra Sankranti and Baisakhi Mela (Shaorail), Siddha-bari Mela (Shaorail), Paush Sankranti Mela (Baldhara and Jaimandap). 

Main exports Paddy, potato, pulse, oil seed, molasses, brass metal products, cattle, poultry, milk, vegetable, papaya, guava, brick, sand. 

NGO activities Operationally important NGOs are Brac, Proshika, Grameen Bank ,ASA, TARD, VIRK, Arab, VON, ITCL, 

Health centres Upazila health complex 1, maternity and child care 1, satellite clinic 1, community clinic 11, family planning centre 10, private clinic 1.