Passing west of Wampus Brook Park, NY 128 intersects with Old Mount Kisco Road, an old alignment as it leaves the town center.

NY 128 soon parallels the park and Wampus Brook on its way north, maintaining the Main Street moniker until an intersection with Old Mount Kisco Road.

[3] Now running northwest, NY 128 crosses through North Castle as a two-lane residential roadway, paralleling Wrights Mill Road into Wampus Pond County Park.

[3] The roadways that make up a majority of NY 128 through Westchester were upgraded to state highway standards in the early 1900s by local contractors.

The segment was completed and accepted into the state highway system on October 1, 1903, over two years after construction began on the 3.21-mile (5.17 km) alignment.

While longer than the other segment, this section of NY 128 was completed and accepted into the state highway system on February 9, 1903, eight months prior to SH 35.