5th Regiment, Pennsylvania Infantry (3 months, 1861)
This regiment was organized at Camp Curtin, Harrisburg, April 20, 1861. It mustered out July 25, 1861. 
Companies in this Regiment with the Counties of Origin
Men often enlisted in a company recruited in the counties where they lived though not always. After many battles, companies might be combined because so many men were killed or wounded. However if you are unsure which company your ancestor was in, try the company recruited in his county first.
The Fifth Regiment was recruited in:
Company A - many men from Allegheny County
Company B - many men from Pittsburg, Allegheny County
Company C - many men from Glen Carron, Shuylekill County
Company D - many men from Huntingdon County
Company E - many men from Minersville, Schulkill County
Company F - many men from Schuykill Haven, Schuylkill County
Company G - many men from Lebanon, Lebanon County
Company H - many men from Reading, Berks
Company I - many men from Minersville, Schuylkill County
Company K - many men from Pittsburg, Allegheny County
National Park Service, The Civil War Soldiers and Sailors System, is searchable by soldier's name and state. It contains basic facts about soldiers on both sides of the Civil War, a list of regiments, descriptions of significant battles, sources of the information, and suggestions for where to find additional information.