Arnold is a very small city located in the state of Pennsylvania. With a population of 4,676 people and three associated neighborhoods, Arnold is the 321st largest community in Pennsylvania.

One interesting thing about the economy is that relatively large numbers of people worked from their home: 10.03% of the workforce. While this number may seem small overall, as a fraction of the total workforce this is high compared to the rest of the county. These workers are often telecommuters who work in knowledge-based, white-collar professions. For example, Silicon Valley has large numbers of people who telecommute. Other at-home workers may be self-employed people who operate small businesses out of their homes.

Despite the fact that it is a small city, Arnold has quite a few people who take public transportation – mostly the bus - for their daily commute to work. This helps to fill a real need in the city for affordable transportation.

The percentage of adults in Arnold with college degrees is slightly lower than the national average of 21.84% for all communities. 16.59% of adults in Arnold have a bachelor's degree or advanced degree.

The per capita income in Arnold in 2022 was $26,869, which is low income relative to Pennsylvania, and lower middle income relative to the rest of the US. This equates to an annual income of $107,476 for a family of four. However, Arnold contains both very wealthy and poor people as well.

Arnold is an extremely ethnically-diverse city. The people who call Arnold home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Arnold residents report their race to be White, followed by Black or African-American. Important ancestries of people in Arnold include German, Italian, Irish, Slovak, and English.

The most common language spoken in Arnold is English. Other important languages spoken here include Polish and African languages.