The Census Bureau’s 2014 American Community Survey found that the overall poverty rate in Rhode Island was 14.3 percent.Many of the poorest families live in Providence County, the state’s urban core. The poverty rate there was 18.1 percent, and the median household income was $47,481. In Washington County, the poverty rate was 10.6 percent, and the median income was $71,229, according to the Census figures, which were released on Thursday. The statewide median household income was estimated at $54,891, compared with the 2013 estimate of $56,776. The mean (average) income per household was estimated at $77,146 for 2014. Rhode Island Kids Count, an advocacy group, noted that 19.8 percent of Rhode Island’s children lived in poverty, compared with a national level of 21.7 percent. Forty percent (84,008) of the state’s children were low-income, which means their families had incomes below 200 percent of the federal poverty threshold.The poverty data are based on the federal poverty threshold, which was an annual income of $19,073 for a family of three with two children and $24,008 for a family of four with two children in 2014.The survey also estimated that 31.7 percent of the state’s households were receiving Social Securit benefits, and that the average Social Security income was $17,518.