iih" (alligator, iih). It was the simple interjection that, connected to the alligator, resulted in Jacareí. The second hypothesis is that the word came from a native Brazilian language (Tupi language) "Icare-ig" that means "river of alligators". Demography Census of 2009 Total Population: 212,824 Urban: 183,377 Rural: 7,914 Men: 94 634 Women: 96,657 Population density (inhabitants / Km ²): 415.85 Infant mortality up to 1 year (per thousand): 16.67 Life expectancy (years): 70.80 Fertility rate (children per woman): 2.19 Literacy rate: 93.97% Human Development Index (HDI): 0.809 Income HDI: 0.752 Longevity HDI: 0.763 Education HDI: 0.913 Authorship: IPEADATA Sister Cities Cluj-Napoca, Romania Kawagoe, Japan References External links Jacareí City Administration Page About Jacareí City