Allentown Population 2024. Population per square mile, 2010: Allentown is currently declining at a rate of annually and its population has increased by 30.88% since the most recent census,.
Allentown, pennsylvania is the 224th largest city in the us. Far behind in terms of population are pittsburgh (304.391), allentown (120,207), erie (99,475) and reading (87,879).