Alexandria is a town in the Thousand Islands region of the U.S. state of New York, within Jefferson County.

The Battle of Cranberry Creek, during the War of 1812, was a minor engagement in which local forces defeated a much larger group of British soldiers and sailors who attempted to regain supplies and provisions taken by the Americans.

The Densmore Methodist Church of the Thousand Islands was listed on the National Register of Historic Places in 1988.

[4] The St. Lawrence River and many of its Thousand Islands occupy the northern part of the town.

NY-12 intersects New York State Route 26 at Alexandria Bay and runs in a southwesterly direction.

New York State Route 12 runs northeast–southwest through the town, near the edge of the St. Lawrence River.

Until 1961 the New York Central Railroad ran trains on its St. Lawrence Division between Ogdensburg and Syracuse, through a station in Redwood on the eastern edge of Alexandria.