As of the 2011 Indian census, Jhajha city has 7,223 houses with population of 40,646 of which 21,406 are males while 19,240 are females. The population of children with ages of 0-6 is 5736 which is 14.11% of total population of Jhajha town. In Jhajha, Female Sex Ratio is of 899 against state average of 918. Moreover, Child Sex Ratio in Jhajha is around 954 compared to Bihar state average of 935. Literacy rate of Jhajha city is 79.13% higher than state average of 61.80%. In Jhajha, Male literacy is around 87.37% while female literacy rate is 69.87%.Schedule Caste (SC) constitutes 13.65% while Schedule Tribe (ST) were 0.98% of total population in Jhajha city.Out of total population, 13,785 were engaged in work or business activity. Of this 9,971 were males while 3,814 were females. In census survey, worker is defined as person who does business, job, service, and cultivator and labour activity. Of total 13785 working population, 76.71% were engaged in Main Work while 23.29% of total workers were engaged in Marginal Work.
Jhajha has fantastic connection of railway to major cities of India. Jhajha railway station is endowed with beautiful sceneries due to the green mountains nearby. Jhajha station is the southern end of eastern central railway of Indian railway situated on Delhi Howrah main line. It also has good connection by roadways to nearby cities through SH18. It has two bus stands from where buses and auto are available for nearby places like Gidhaur, Khuriparas, Sono, Borba, Belhar etc. Small vehicles are available for travelling to villages near the cities. Rickshaw and auto rickshaw is also part of transportation for small distances.
Jhajha has one degree college, four higher secondary schools, Seven high schools, three middle schools and number of primary schools. St. Joseph's school is best school in the city providing quality education starting from nursery to class ten which is a single school affiliated to ICSE New Delhi in Jamui district. Sardonyx school which has recently got affiliation from CBSE New Delhi is also supporting to education system of the city.The City also has Jhajha Public School which is an English-medium school. It is located in the heart of Jhajha, and providing education from nursery to class 6th. This is only school which provide martial art classes music class, dance classes, and smart classes also. Mahila College, Jhajha is the only girls' college in the entire Jamui district.A new Kendriya Vidyalaya has been granted by HRD department of Government of India by the efforts of Jamui MP.Chirag Paswan. Simultala Awasiya Vidyalaya has also been established in 2010 in Simultala which falls under Jhajha Block.
The city is considered to be good for education up to class ten. Students are seen migrating to nearby cities like Deoghar, Patna, Giridih, Bokaro, Ranchi, Jamshedpur, Dhanbad and Bhagalpur after completing class ten. There is not even a single college with commerce discipline for graduation. Large number of students migrate to Delhi, Karnataka, Tamil Nadu, Punjab, and UP for higher education.
Nagi Dam and Nakti Dam Bird Sanctuary Site description: The Nagi Dam (791 ha) and Nakti Dam (332 ha) are two sanctuaries so close to each other that they can be taken as one bird area. Nagi is 7 km from Jhajha in the Jamui District, and Nakti is a further 4 km from Nagi, occupying similar habitat. These notified sanctuaries are surrounded by rocky hillocks, formed by the damming of streams. Both these waterbodies are quite deep, with a clear water surface. These dams were built to supply water to local farms. There are cultivable lands adjacent to both the waterbodies.
Birds: About 1,600 bar-headed geese (Anser indicus) have been recorded from this site. According to Wetlands International (2002), 1% threshold of this species is 560; accordingly about 3% of the population is found at this IBA site. This site could also attract more than 20,000 birds, if fishing and other disturbances are curtailed during winter when most of the migrants are found in India. Beyond the cultivated areas, these waterbodies are surrounded by barren, rocky terrain. Consequently, dryland birds are also seen, such as the Indian courser Cursorius coromandelicus, chestnut-bellied sandgrouse (Pterocles exustus), yellow-wattled lapwing (Vanellus malabaricus) and Indian robin (Saxicoloides fulicata). The site falls in Biome-12, i.e. Indo-Gangetic plains, but species of Biome-11 are also sighted.Lok Nayak Jayaprakash Airport, Patna (199 km)
Gaya Airport, Gaya (174 km)
Netaji Subhas Chandra Bose International Airport, Kolkata (386 km)
Birsa Munda Airport, Ranchi (367 km)
Deoghar International Airport, Deoghar (57 km). This airport is under construction and will start functioning by the end of 2016.