Greenfield is the name of District 3 in Port Justin, Jill. The Greenfield area contains most of Port Justin's middle class suburbs. While most of the area is suburban, Greenfield also contains the city's rainforest, which has some of the wealthiest residents in the country living there.

Greenfield was mostly built during the 1920s and 1930s after the city expanded by buying out the large packet of land. Since then, the area has developed into Port Justin's more family-oriented section. Both Highway 626 and City Freeway 10 pass through the vicinity. The famous Golden Strip was also part of the Greenfield area until 1962, when it was founded as a new, independent district.

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