A second top-of-the-scale tornado occurred on May 20, 2013; South Oklahoma City, along with Newcastle and Moore, was hit by an EF5 tornado. The tornado was wide and killed 23 people. On May 31, less than two weeks after the May 20 event, another outbreak affected the Oklahoma City area. Within Oklahoma City, the system spawned an EF1 and an EF0 tornado, and in El Reno to the west, an EF3 tornado occurred. This lattermost tornado, which was heading in the direction of Oklahoma City before it dissipated, had a width of , making it the widest tornado ever recorded. Additionally, winds of > were measured, one of the two highest wind records for a tornado. With of rainfall, May 2015 was by far Oklahoma City's record-wettest month since record-keeping began in 1890. Across Oklahoma and Texas generally, there was a record flooding in the latter part of the month. According to the 2010 census, the racial composition of Oklahoma City was as follows: As of the 2010 census, there were 579,999 people, 230,233 households, and 144,120 families residing in the city. The population density was 956.4 inhabitants per square mile (321.9/km2). There were 256,930 housing units at an average density of 375.9 per square mile (145.1/km2). Of Oklahoma City's 579,999 people, 44,541 reside in Canadian County, 63,723 reside in Cleveland County, 471,671 reside in Oklahoma County, and 64 reside in Pottawatomie County. There were 230,233 households, 29.4% of which had children under the age of 18 living with them, 43.4% were married couples living together, 13.9% had a female householder with no husband present, and 37.4% were non-families. One person households account for 30.5% of all households, and 8.7% of all households had someone living alone who was 65 years of age or older. The average household size was 2.47 and the average family size was 3.11. The median income for a household in the city was $48,557 and the median income for a family was $62,527. The per capita income for the city was $26,208. 17.1% of the population and 12.4% of families were below the poverty line. Out of the total population, 23.0% of those under the age of 18 and 9.2% of those 65 and older were living below the poverty line.