Elizabethtown is a borough in Lancaster County, Pennsylvania, United States. It is located 18 miles (29 km) southeast of Harrisburg, the state capital. Small factories existed at the turn of the 20th century when the population in 1900 was 1,861. As of the 2020 census, the population of the borough was 11,639. Elizabethtown is commonly referred to in south-central Pennsylvania as "E-Town." This nickname is also used for the local college and high school.

Mars Inc. is an American multinational manufacturer of confectionery, pet food, and other food products and a provider of animal care services, with US$45 billion in annual sales in 2022; that year Forbes ranked the company as the fourth-largest privately held company in the United States. Headquartered in McLean, Virginia, the company is entirely owned by the Mars family. Mars operates in four business segments around the world: Mars Wrigley Confectionery, Petcare, Food, and MARS Edge, the company's life sciences division.