Which county contains no land area designated in any area other than planning areas 1, 2, or 3, aside from parklands?

The correct answer highlights that Union County has been designated with land areas that primarily fall within planning areas 1, 2, or 3, which are generally associated with urban and suburban land uses that accommodate growth and development. Planning areas in New Jersey are established to guide regional planning, zoning, and land-use decisions.

In Union County, most of the land area is consistent with developed urban and suburban uses, which aligns with their classification into the aforementioned planning areas. Other counties such as Bergen, Hudson, and Essex encompass a range of planning areas, indicating they have designated lands outside of areas 1, 2, or 3 for different purposes, including more rural or unplanned regions.

This distinction is crucial for understanding regional planning dynamics in New Jersey and signifies Union County's focus on urban-centric development patterns while maintaining its parklands. Hence, it's important to recognize that planning areas are integral in strategizing land use and development policies effectively in New Jersey.