By the early 20th century, the town reached the height of its prosperity and the population has since declined by about a third from its peak of around 45,000 in 1950.
Williamsport is the birthplace of Little League Baseball.
The city is the original home of Little League Baseball, founded in 1939 as a three-team league.
Following World War II the city's population and economic prosperity have declined.
The average household size was 2.30 and the average family size was 2.97. For every 100 females age 18 and over, there were 95.9 males.