Maps of all U.S. states that include county lines are available on MapsOfWorld.com. Additionally, a tool that superimposes county lines on Google Maps can be found at Mob-Rule.com.
Counties are geographic subdivisions of states that have their own independent government and officials. County governments are entrusted with duties separate from those entrusted to state and city level governments. Some duties that take place at the county level include the maintaining of public records, maintaining law enforcement services and courts, coordinating public health initiatives, and maintaining public infrastructure. County governments also organize and fund polling places for national and local elections.