Plymouth is a city located in Pennsylvania. With a 2020 population of 5,790, it is the 154th largest city in Pennsylvania and the 4374th largest city in the United States. Plymouth is currently declining at a rate of -0.07% annually and its population has decreased by -2.71% since the most recent census, which recorded a population of 5,951 in 2010. Plymouth reached it's highest population of 16,996 in 1910. Spanning over 1 miles, Plymouth has a population density of 5,276 people per square mile.
The average household income in Plymouth is $47,117 with a poverty rate of 19.45%. The median rental costs in recent years comes to $700 per month, and the median house value is $74,300. The median age in Plymouth is 38.9 years, 35 years for males, and 40 years for females. For every 100 females there are 95.2 males.