In the early 20th century, Philly was considered the candy capital of the United States. The industry had exploded in the city from just 20 small stores in the early 1800s to more than 130 shops, manufacturers, and distributors, according to a 1917 educational pamphlet from the Philadelphia Chamber of Commerce. Their combined sales volume was more than $7 million, equivalent to around $200 million today.

This article posted in Billy Penn mentions some of the most well-known candy manufacturers in the city and state. 

https://billypenn.com/2021/04/04/how-philly-and-pennsylvania-grew-to-dominate-the-candy-industry/?mc_cid=cb735bf38a&mc_eid=86d78fe14e