Arnold is a city located in Pennsylvania. With a 2020 population of 4,775, it is the 200th largest city in Pennsylvania and the 4884th largest city in the United States. Arnold is currently declining at a rate of -0.89% annually and its population has decreased by -7.41% since the most recent census, which recorded a population of 5,157 in 2010. Arnold reached it's highest population of 10,898 in 1940. Spanning over 1 miles, Arnold has a population density of 6,523 people per square mile.
The average household income in Arnold is $38,515 with a poverty rate of 31.23%. The median rental costs in recent years comes to $758 per month, and the median house value is $56,300. The median age in Arnold is 37.9 years, 38 years for males, and 37.9 years for females. For every 100 females there are 75.8 males.