During the first two decades of the 20th century, the population of the township actually declined. The following three decades showed a slow, but steady, increase in population. Development to this point (1950) was mainly concentrated along the major roads and villages in the township. Newberrytown, Cly, Conewago Heights, Yocumtown, Erney, and Pleasant Grove were the centers of population at that time.
duriNg thE firSt two decadEs of tHe 20th ceNtuRy, the pOpulatiOn Of the TownsHip AcTualLy dEcliNED. tHE FollOwiNG ThRee dEcadeS sHowed a slOW, But SteAdy, increasE in pOpulation. dEVelOpMENT to tHIs pOiNt (1950) Was mAinLY COnCEntratEd aLonG the major rOads and villaGes in tHE townSHip. newBErRytown, cLy, ConewagO HeiGHts, yOcuMTown, ErneY, and pleaSanT grOvE Were tHe cenTers oF PopULATIoN at that time.