(Harrisburg) -- The recently released map of proposed changes to the Commonwealth's Congressional districts shakes up who represents the midstate in Washington. Four members of congress currently represent most of south central Pennsylvania, but that number could double if the new map is adopted. Changes include separating an eastern chunk of Lancaster County from the current county-encompassing 16th district and working different districts into Lebanon, Perry, Berks and Dauphin counties. The new map also adds Harrisburg to a new fourth district, which includes much of the West Shore and York and Adams counties - it's roughly the area currently known as the 19th district. Pa. Sen. Chuck McIllhinney, chair of the Senate State Government Committee says the map is not necessarily the final product. "The rationale was based upon input we collected throughout the year, and we decided with legislative leaders and interested parties this is the proposal we're putting forward," he says. The proposed map adds Schuylkill County to a district that stretches into the Lehigh Valley, while Franklin County will remain entirely in the 9th district - where it sits now. Democrats complain the map makes little geographic sense.