Coordinates: 20°53?28?S 47°35?06?W? / ?20.89111°S 47.58500°W? / -20.89111; -47.58500Batatais is a municipality in the state of São Paulo in Brazil. The population in 2009 is 58,806 and the area is 853.13 km². The elevation is 862 m. The village was named as a city on March 14, 1839, considered the city's day. Washington Luís, president of Brazil around 1929, was the city mayor on 1899.