Arnold is a very small city located in the state of Pennsylvania. With a population of 4,706 people and three associated neighborhoods, Arnold is the 321st largest community in Pennsylvania.

A relatively large number of people in Arnold telecommute to their jobs. Overall, about 8.46% of the workforce works from home. While this may seem like a small number, as a fraction of the total workforce it ranks among the highest in the country. 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.

The citizens of Arnold are slightly less educated than the national average of 21.84% for the average city or town: 15.87% of adults in Arnold have a bachelor's degree or advanced degree

The per capita income in Arnold in 2018 was $24,363, which is low income relative to Pennsylvania and the nation. This equates to an annual income of $97,452 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 Polish.

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