The new store is open from 8 a.m. until 8 p.m. seven days a week.
Dollar General had a previous store at 5544 Elevator Road.
"The new location will provide Roscoe residents with an updated layout and additional offerings including stylish, on-trend home décor and an expanded party preparation selection," Dollar General spokesperson Angela Petkovic said in an email.
Dollar General is headquartered in Goodlettsville, Tennessee and operates 13 stores in Winnebago and Boone counties.
The company specializes in household essentials including food, cleaning supplies, paper products, over-the-counter medicines, hygiene products and baby items.