PIP: This article describes Tibet's population size, intercensal growth, and regional distribution. Data were obtained from the 1990 China Census of Population and prior censuses. The data pertain to the population living in Tibet Autonomous Region, regardless of ethnicity. Population in Tibet increased from about 1 million in 1951, to 2.196 million in 1990. Intercensal growth during 1982-90 was 20.73/1000. The annual growth rate of Tibetans was 21.79/1000 in Tibet, compared to 20.88 among Tibetans in Sichuan state, 24.10 in Qinghai, 23.58 in Gansu, and 18.79 in Yunnan. The total Tibetan population residing throughout China amounted to 4.593 million, which was a 22.38/1000 increase since 1982. In 1951, Tibetan population was 2.776 million. Tibetan population is concentrated in Tibet with 2.096 million persons. The next largest concentrations of Tibetan population reside in Sichuan province (1.087 million), particularly in Aba, Ganzi, and Muli. The Tibetan population living in Qinghai province (912,160 persons) mostly live in Yushu (219,336), followed by Hainan (194,399), Haidong (163,878), Huangnan (115,813), Guoluo (105,645), Haibei (52,336), Haixi (30,899), and Xining City (29,854). Tibetans are also in Gansu province (367,006 persons), especially in Gannan (276,844) and Tianzhu (55,617). Tibetans in Yunnan province live predominantly in Diqing (104,366 persons).