The harborfront section of Port Jefferson, 5 miles to the West, serves as a primary commercial downtown walking area for residents of both Miller Place and Mount Sinai.

The parcel also included what would become Mount Sinai, an adjacent community of similar character with which Miller Place would share a variety of functions throughout its history.

The first known dwelling in the area was constructed in the 1660s by Captain John Scott, an important figure in Long Island's early history.

This house was named Braebourne and features on a map of the New England region credited to Scott, who served as a royal advisor and cartographer among other occupations.

This abode, on the eastern side of Mount Sinai Harbor, was one of three houses John Scott commissioned, and the actual occupier is unknown.

A number of midnight raids occurred, one of which resulted in the shooting of a teenage Miller who had peered out of his window to check on the commotion.

The march of Benjamin Tallmadge, who led eighty men to the victorious overthrow of a British stronghold at Manor St. George, traversed along the town's western border.

The Miller Place Academy structure remains as one of the community's symbols and currently houses a free library.

In 1895 the hamlet became home to a station of the Long Island Rail Road, which was located near the present-day intersection of Sylvan and Echo Avenues.

[5] In 2013 an agreement was signed between local politicians and the Long Island Power Authority (LIPA), which currently manages the strip on which the railroad operated, to convert this land into a public bicycle trail.

This led to a building boom of beach-side bungalows, rustic log cabins, and commercial activities to accommodate the new seasonal residents.

In the decades following World War II, the population of Miller Place greatly expanded, and the majority of beach cottages were repurposed as family homes.

The plan additionally calls for the preservation of the DeLea Sod Farm, the largest agricultural parcel remaining on the Miller Place stretch of Route 25a.

Along North Country Road is McNulty's, a family-owned ice cream parlor and a fixture of the hamlet, and a handful of inns and restaurants located in historic structures.

Commuters either use the Long Island Rail Road, with the nearest stations in Port Jefferson and Ronkonkoma, or drive along the extensive highway system that had been developed by Robert Moses.