Kolebira block
Kolebira block is a CD block that forms an administrative division in the Simdega subdivision of Simdega district, in the Indian state of Jharkhand. History
Gumla district was carved out of Ranchi district in 1983. Till 30 April 2001, Simdega was a subdivision of Gumla district and was made a separate district from that date. Maoist activities
According to a PIB release in 2018, Simdega is one of the thirty districts most affected by Left wing extremism in the country (along with twelve other districts of Jharkhand). “The terrain of the district is very tough and geography is favourable for naxal activities.” All police stations in the district are well fortified and equipped to handle the situation. Community policing activities are being prioritised to involve the simple village folk. Hemant Soren, Chief Minister of Jharkhand, has claimed, in September 2021, that as a result of the effective action against left wing extremism, the “presence of hardcore Maoists has been limited to mainly four regions, namely Parasnath Pahar, Budha Pahar, Tri-junction of Seraikela-Khunti-Chaibasa district in Kolhan division and some of the areas along the Bihar border”. Geography
Simdega district lies in the south-western part of the Chota Nagpur Plateau. It has been described as “a dissected upland of ancient crystalline rocks” The general elevation of the district is  above mean sea level. The landscape is formed of hills and undulating plateau. The Major rivers of this area are Sankh, Deo, Girwa, and Palamara. Kolebira CD block has an area of 437.44 km2.Kolebira  police station serves Kolebira CD block. The headquarters of Kolebira CD block is located at Kolebira village. Kolebira CD block is bounded by Basia in Gumla district on the north, Bano CD block on the east, Jaldega CD block on the south, and Thethaitangar and Simdega CD blocks on the west. Demographics

Population    
According to the 2011 Census of India, Kolebira CD block had a total population of 71,283, all of which were rural. There were 35,993 (50%) males and 35,290 (50%) females. Population in the age range 0–6 years was 11,437. Scheduled Castes numbered 9,292 (13.04%) and Scheduled Tribes numbered 44,590 (62.55%). Literacy
According to the 2011 census, the total number of literate persons in Kolebira CD block was 42,131 (70.40% of the population over 6 years) out of which males numbered 23,248 (77.33% of the male population over 6 years) and females numbered 18,883 (63.40% of the female population over 6 years). The gender disparity (the difference between female and male literacy rates) was 13.92%. census, literacy in Simdega district was 67.59%. Literacy in Jharkhand was 67.63% in 2011. Literacy in India in 2011 was 74.04%. See also – List of Jharkhand districts ranked by literacy rate

Language and religion

According to the Population by Mother Tongue 2011 data, in the Kolebira subdistrict, Hindi was the mother-tongue of 33,874 persons forming 47.70% of the population, followed by (number of persons and percentage of population in brackets) Mundari (19,012/ 28.83%), Kharia (14,686/20.68%), Urdu (647, 0.91%), Kurukh (578/ 0.81%), Odia (513, 0.72) and persons with other languages as mother-tongue (243/ 0.34%). Persons with Hindi as mother-tongue included 25,291 persons having Sadri/ Sadan, 5,542 persons having Nagpuri as mother-tongue. Note: An attempt has been made to include all language groups each with at least 300 persons as their mother-tongue and only those groups with less than 300 persons as their mother-tongue are included in the “other languages” category. Comparatively smaller language groups with 200+ persons as their mother-tongue are mentioned in the text. Many languages have sub-groups. Those who are interested can see the reference for more details. Hindi is the official language in Jharkhand and Urdu has been declared as an additional official language. According to the Population by Religious Communities 2011 data, in the Kolebira subdistrict, Christians numbered 32,753 and formed 45.95% of the population, followed by (number of persons and percentage of population in brackets) Hindus (26,798/ 37.59%), Muslims (2,204/ 3.09%), persons who did not state their religion (279/ 0.39%), and ‘Other religious communities’ (9,249/ 12.98%). Scheduled Tribes numbered 424,407 and formed 70.78% of the total population of Simdega district. Within the scheduled tribes the more populous tribes were (percentage of ST population in 2011 in brackets): Munda, Patars (33.61%), Kharia, Dhelki Kharia, Dudh Kharia, Hill Kharia (25.42%), Oraon, Dhangar Oraons (20.13%), Gonds (5.77%) and Lohras (5.32%). Economy

Overview  
The District Census Handbook, Simdega, mentions, “Simdega is one of the least developed districts in the country... As per the survey conducted for the year 1997 –2002 five-year plan more than 60% of population is below poverty line.” Another report says that 80% and over of the population of Simdega district were in the BPL category in 2004–2005. In 2011-12, the proportion of BPL population in Simdega district came down to 38.26%. According to a study in 2013 (modified in 2019),"the incidence of poverty in Jharkhand is estimated at 46%, but 60% of the scheduled castes and scheduled tribes are still below poverty line." Livelihood

In Kolebira CD block in 2011, amongst the class of total workers, cultivators numbered 21,939 and formed 60.25%, agricultural labourers numbered 9,128 and formed 25.07%, household industry workers numbered 977 and formed 2.68% and other workers numbered 4,367 and formed 11.99%. Total workers numbered 36,411 and formed 51.08% of the total population, and non-workers numbered 34,872 and formed 48.92% of the population. Infrastructure
There are 53 inhabited villages in Kolebira CD block. In 2011, 27 villages had power supply. 1 village had tap water (treated/ untreated), 53 villages had well water (covered/ uncovered), 53 villages had hand pumps, and all villages have drinking water facility. 5 villages had post offices, 8 villages had sub post offices, 5 villages had telephone (land lines), 38 villages had mobile phone coverage. 53 villages had pucca (paved) village roads, 17 villages had bus service (public/ private), 13 villages had autos/ modified autos, 5 villages had taxi/ vans, 22 villages had tractors. 3 villages had bank branches, 2 villages had agricultural credit societies, 27 villages had ration shops, 34 villages had assembly polling stations. Agriculture
According to the District Census Handbook, Simdega, the rural population depends mainly on agriculture for a living. Agriculture in Simdega is in a very primitive state. The district has about 32% of forested area. Out of 1,34,024 hectares of cultivable land only 4,669.83 hectares of land is irrigated. Agriculture is mainly dependent on seasonal rain. The average rainfall of the district is 1100–1200 mm but much of it remains unutilised. Backward Regions Grant Fund
Simdega district is listed as a backward region and receives financial support from the Backward Regions Grant Fund. The fund, created by the Government of India, is designed to redress regional imbalances in development. As of 2012, 272 districts across the country were listed under this scheme. The list includes 21 districts of Jharkhand. Education
Kolebira CD block had 15 villages with pre-primary schools, 50 villages with primary schools, 32 villages with middle schools, 6 villages with secondary schools, 2 villages with senior secondary schools, all villages have educational facility. . *Senior secondary schools are also known as Inter colleges in Jharkhand

S.K.Bage College was established in 1985 at Kolebira. Culture
Kolebira is surrounded with rock mountain and having old temples . Six Major Temples are 1. Mahadev Sharna Shiv Temple, Near Kolebira Dam, 2. Devi Gudi, Durga Temple near High School, 3. Mahaveer Mandir Near bano Chowk, 4. Bhagwan Jagannath Temple at Bhawar Pahar and 5. Ramnavmi Mandir at Ramnavmi Pahar and 6. Bhaghchandi Mandir 10 km From Kolebira . Healthcare
Kolebira CD block had 1 village with primary health centre, 14 villages with primary health subcentres, 2 villages with maternity and child welfare centres, 5 villages with allopathic hospitals, 3 villages with dispensary/ health centres, 2 villages with family welfare centres, 11 villages with medicine shops. . *Private medical practitioners, alternative medicine etc. not included

There is a Community Health Centre (hospital) at Kolebira. 