Krishnagiri district is a district in the state of Tamil Nadu, India and is one of the 6 districts of Tiruvannamalai region . The municipal town of Krishnagiri is the district headquarters. In Tamil Nadu, e-Governance was first introduced at Krishnagiri district under the National e-Governance Project (NEGP) in revenue and social welfare departments on a pilot basis.The district is one of the largest producers of Mangoes in India.As of 2011, the district had a population of 1,879,809 with a sex-ratio of 958 females for every 1,000 males

‘Krishna’ refers to ‘black’ and ‘giri’ refers to ‘hill’. The area contains many granite hillocks hence the name ‘Krishnagiri’. The region was under the rule of Krishna Deva Raya and hence it might also have been named after him.

Krishnagiri district was formed as the 30th district separate district of Tamil Nadu on February 9, 2004. Krishnagiri District was formed by carving out five taluks and ten blocks of the erstwhile Dharmapuri district.

Krishnagiri district covers an area of 5143 km². Krishnagiri district is bound by Vellore and Thiruvannamalai districts to the East, state of Karnataka to the west, state of Andhra Pradesh to the North and Dharmapuri District to the south. This district is elevated from 300m to 1400m above the mean sea level. It is located between 11° 12′ N and 12° 49′ N latitude, 77° 27′ E to 78° 38′ E longitude.

According to 2011 census, Krishnagiri district had a population of 1,879,809 with a sex-ratio of 963 females for every 1,000 males, much above the national average of 929.A total of 217,323 were under the age of six, constituting 112,832 males and 104,491 females. Scheduled Castes and Scheduled Tribes accounted for 14.22% and 1.19% of the population respectively. The average literacy of the district was 63.2%, compared to the national average of 72.99%.The district had a total of 448,053 households. There were a total of 877,779 workers, comprising 218,600 cultivators, 197,369 main agricultural labourers, 15,237 in house hold industries, 310,795 other workers, 135,778 marginal workers, 17,438 marginal cultivators, 65,959 marginal agricultural labourers, 6,681 marginal workers in household industries and 45,700 other marginal workers.Tamil is the official and majorly spoken language while Telugu and Kannada urdu also spoken in parts of the district . Hinduism is the major religion followed by Islam and Christian minorities.

The important crops of Krishnagiri District are Paddy, Maize, Ragi, Banana, Sugarcane, Cotton, Tamarind, Coconut, Mango, Groundnut, Vegetables and Flowers. The district has an excellent scope for agri business. Regional Agricultural Research Center of Tamil Nadu Agricultural University is functioning efficiently at Paiyur in Kaveripattinam union since 1973. This center is functioning in 18.5 hec. of land. It helps the peasants to develop and adopt the modern technique of cultivation. It has developed hybrid seeds by research which yields more tonnage and good quality. Krishnagiri district is famous for Mangoes. Krishangiri district is also famous for the Granite Industry with quarries and processing units spread around the district. Hosur, one of the most industrialized places in the state is located in this district. With 40% share, the district is the top producer of Ragi in Tamil Nadu.

In Krishnagiri district, quarry leases are being granted for granite in Patta lands and rough stone and earth quarry leases are being granted in Government and patta lands under Tamil Nadu Minor Mineral Concession Rules 1959. Public works Department (WRO wing) is operating sand quarry in riverbeds. A state owned corporation called Tamil Nadu Metals and Mineral Ltd is also earning quarry / Mining grants etc. in Government lands. The total mineral revenue realized during the year 2006-07 is Rs. 7.45 crores. It is ascertained that nearly 7,000 workers are being engaged in quarry activities. As Krishnagiri District has 2,02,409 hectares of forest land which constitutes 39% of the total geographical area, there are abundant produce from the forest areas. Bamboo products, honey collection and tamarind production are the forestry land activities found in Anchetty, Denkanikotta, Thally and Berigai areas. This has generated employment opportunities to thousands of rural people in these areas.