Indian Himalayan Region in the context of Koshi River

Himachal Pradesh (Hindi: Himācal Pradeś, pronounced [ɦɪˈmäːtʃəl pɾəˈd̪eːʃ]; Sanskrit: himācāl prādes; lit. "Snow-laden Mountain Province") is a state in the northern part of India. Situated in the Western Himalayas, it is one of the 13 mountain states and is characterised by an extreme landscape featuring several peaks and extensive river systems. Himachal Pradesh is the northernmost state of India and shares borders with the union territories of Jammu and Kashmir and Ladakh to the north, and the states of Punjab to the west, Haryana to the southwest, Uttarakhand to the southeast and a very narrow border with Uttar Pradesh to the south. The state also shares an international border to the east with the Tibet Autonomous Region in China. Himachal Pradesh is also known as Dev Bhoomi, meaning 'Land of Gods' and Veer Bhoomi which means 'Land of the Brave'.

The predominantly mountainous region comprising the present-day Himachal Pradesh has been inhabited since pre-historic times, having witnessed multiple waves of human migrations from other areas. Through its history, the region was mostly ruled by local kingdoms, some of which accepted the suzerainty of larger empires. Prior to India's independence from the British, Himachal comprised the hilly regions of the Punjab Province of British India. After independence, many of the hilly territories were organised as the Chief Commissioner's province of Himachal Pradesh, which later became a Union Territory. In 1966, hilly areas of the neighbouring Punjab state were merged into Himachal and it was ultimately granted full statehood in 1971.

The term Himalayan states is used to group countries that straddle the Himalayas. It primarily denotes Bhutan, China, India, Nepal, and Pakistan; some definitions also include Afghanistan and Myanmar. Two countries—Bhutan and Nepal—are located almost entirely within the mountain range, which also covers southern Tibet, the Indian Himalayan Region, and northern Pakistan.

The inhabitants of this region are mostly speakers of the Indo-Aryan languages and the Tibeto-Burman languages.

The Republic of India is home to several hundred languages. Most Indians speak a language belonging to the families of the Indo-Aryan branch of Indo-European (c. 77%), the Dravidian (c. 20.61%), the Austroasiatic (precisely Munda and Khasic) (c. 1.2%), or the Sino-Tibetan (precisely Tibeto-Burman) (c. 0.8%), with some languages of the Himalayas still unclassified. The SIL Ethnologue lists 424 living languages in India.

The decennial census of India has been conducted 15 times, as of 2011. While it has been undertaken every 10 years, beginning in 1872 under Viceroy Lord Mayo, the first complete census was taken in 1872. Post 1949, it has been conducted by the Registrar General and Census Commissioner of India under the Ministry of Home Affairs, Government of India. All the censuses since 1951 were conducted under the 1948 Census of India Act, which predates the Constitution of India. The 1948 Census of India Act does not bind the Union Government to conduct the census on a particular date or to release its data in a notified period. The last census was held in 2011, whilst the next was to be held in 2021 before it was postponed due to the COVID-19. The next 16th census will commence from 1st October 2026 for the Himalayan states and 1st March 2027 for rest of the Indian states.