SALEM
----- by 1830 eastern half remains SALEM
-------------------------- by 1873 northeast quarter remains SALEM
-------------------------- by 1873 southeast quarter is OTTER CREEK
-------------------------- by 1873 southwest quarter is HEMPFIELD
-------------------------- by 1873 northwest quarter is SUGAR GROVE
----- by 1830 western half is WEST SALEM
--------------- by 1850 northern third of West Salem is GREENE

SANDY CREEK
----- by 1830 western half remains SANDY CREEK
-------------------------- by 1873 northwest quarter remains SANDY CREEK
-------------------------- by 1873 northeast quarter is DEER CREEK
-------------------------- by 1873 southeast quarter is NEW VERNON
-------------------------- by 1873 southwest quarter is PERRY
----- by 1830 eastern half is FRENCH CREEK
--------------- by 1850 bottom half of French Creek is MILL CREEK

COOL SPRING
----- by 1830 western half remains COOL SPRING
-------------------------- by 1873 southwest quarter remains COOL SPRING
-------------------------- by 1873 northwest quarter is FAIRVIEW
-------------------------- by 1873 northeast quarter is LAKE
-------------------------- by 1873 southeast quarter is JACKSON
----- by 1830 eastern half by 1830 is SANDY LAKE
--------------- by 1850 bottom half of Sandy Lake is WORTH

WOLF CREEK
----- by 1830 northeastern quarter remains WOLF CREEK
-------------------------- by 1873 upper third remains WOLF CREEK
-------------------------- by 1873 middle third is PINE
-------------------------- by 1873 bottom third is LIBERTY
----- by 1830 northwestern quarter is SPRINGFIELD
--------------- by 1850 northern half of Springfield is FINDLEY
-----  by 1830 bottom half is SLIPPERY ROCK
--------------- by 1850  all of Slippery Rock goes to Lawrence County 

                       (no longer Mercer Co)

NESHANNOCK
----- by 1830 southeastern quarter remains NESHANNOCK
--------------- by 1850  all of Neshannock goes to Lawrence County               

                        (no longer Mercer Co)
----- by 1830 northeastern quarter is LACKAWANNOCK
--------------- by 1850 bottom third of Lackawannock is WILMINGTON
--------------- by 1850  eastern third of Lackawannock is EAST

LACKAWANNOCK
----- by 1830 northwestern quarter: is SHENANGO
----------by 1840, upper half to HICKORY (see Pymatuning)
----- by 1830 southwestern quarter is MAHONING
--------------- by 1850  all of Mahoning goes to Lawrence County 

                           (no longer Mercer Co)

PYMATUNING
----- by 1830 western half remained PYMATUNING
--------------- by 1840 bottom half to HICKORY (see Shenango)
----- by 1830 eastern half is DELAWARE
-------------------------- by 1873 upper half remains DELAWARE
-------------------------- by 1873 bottom half is JEFFERSON