sentences:  About 8.90% of families and 12.80% of the population were below the poverty line, including 16.00% of those under age 18 and 19.40% of those age 65 or over.The county is governed by the Johnston County Board of Commissioners, a seven-member board of County Commissioners, elected to serve four-year terms.The commissioners enact policies such as establishment of the property tax rate, regulation of land use and zoning outside municipal jurisdictions, and adoption of the annual budget.