Mountain Avenue Historic District, Historic district near Mountain Lakes Preserve in Princeton, United States.

Mountain Avenue Historic District covers 9 acres on the north side of Mountain Avenue in Princeton, from the west edge of the Mountain Lakes Preserve to Quarry Lane. Its 14 contributing buildings date from the 19th and early 20th centuries; 81 Mountain Avenue was finished in 1905 for Francis J. Reed, and 73 Mountain Avenue appears on a 1903 map.

The tract was sold to Richard Stockton by William Penn in 1701, and Mountain Avenue opened in 1793 as part of a road from Blawenburg to Princeton. Peter Stryker held an 80-acre tract by 1796; after Samuel Updike's death in 1863 the land passed through owners to Stephen Margerum Jr. in 1883, who dammed a stream to found the Princeton Ice Company. Rodman Henderson began selling lots in 1900, and Francis J. Reed finished 81 Mountain Avenue in 1905.

The buildings show different architectural styles from various periods that visitors can see while walking along the street. Each house reflects how people lived and built their homes across different times.

The location sits near a nature preserve and is easy to explore on foot by walking through the neighborhood. The best way to experience it is to move slowly so you can notice the details of each building as you pass by.

An ice factory once operated here until 1929, making ice blocks for local people to use. The operation relied on the streams and water sources in this area before mechanical refrigeration became common.