The remaining 34 branches of its KNBT Division in the Lehigh Valley, and five branches of its Nittany Bank Division in Centre County, now bear the National Penn moniker.
That means all of the banks 119 branches now carry the same name.
The changeover of the last of the branches was announced in October when National Penn announced it was moving its headquarters to the City Center development in Downtown Allentown.
Dave Kennedy, senior executive vice president and chief banking officer, said "these changes will bring National Penn a brand continuity across our regions and reinforce our presence in the marketplace."
The renaming follows similar efforts to rename National Penn-owned banks in Schuylkill County in 2011 and in Monroe, Carbon and Luzerne counties last year.
Kennedy said staffers have made a point of getting the word out to customers that the name change would be coming, so no one should have been surprised when the last of the signs went up on Monday.
Meanwhile, he said, the internal excitement over the name change is "very high."
"This renaming wrapped up us getting our house entirely under one name," said Kennedy.
He said he expects the changeover will help the bank raise its profile throughout its marketplace and strengthen its brand.