Northwest Harborcreek is a census-designated place (CDP) in Erie County, Pennsylvania, United States.

[3] It includes the unincorporated communities of Fairfield and Brookside and is part of the Erie Metropolitan Statistical Area.

It is located at 42°8′53″N 79°59′44″W / 42.14806°N 79.99556°W / 42.14806; -79.99556 (42.148144, -79.995597)[4] and is bordered to the west by Lawrence Park Township, the borough of Wesleyville, and the city of Erie.

Pennsylvania Route 430 passes through the southwestern (Brookside) part of the CDP, leading northwest into Wesleyville and southeast 2 miles (3 km) to Interstate 90 at Exit 32.

According to the United States Census Bureau, the CDP has a total area of 5.0 square miles (13.0 km2), all land.