Delmar is a hamlet in the Town of Bethlehem, in Albany County, New York, United States. It is a suburb of the neighboring city of Albany. The community is bisected by NY Route 443 (Delaware Avenue), a major thoroughfare, main street, and route to Albany.
In 1980, the U.S. Census Bureau began treating Delmar as a census-designated place (CDP). The population of Delmar was 8,292 at the 2000 census. Delmar was not included as a CDP in the 2010 census.
In 2005, CNN/Money Magazine named the Delmar ZIP Code (an area larger than the Delmar CDP) as one of the "Best Places to Live" in America, rating it the 22nd best place to live among what it called "Great American Towns."
History
thumb|150px|left|Albany and Susquehanna Railroad's Delmar Station, 1907
Nathaniel Adams moved to the area in 1836 and, two years later, built a large hotel and made other improvements. When the first post office was built in 1840, he became the first post master.
thumb|150px|left|Map of Delmar in 1891
After Adamsville received its post office, mail began to get confused with the town of Adams, New York, which also had an Adams Village. The name of the post office was changed to Adams Station in an attempt to relieve that confusion. The Albany and Susquehanna Railroad, which had a station on Adams Street north of Kenwood Avenue, however, had chosen to change from Adamsville to Delmar. In 1892, a petition by area residents to change the post office to match Delmar was accepted.
The Patterson Farmhouse, United States Post Office, and Van Derheyden House are listed on the National Register of Historic Places.
Geography
As a hamlet, the borders of Delmar are indeterminate, though it is considered to be centered on the intersection of Kenwood and Delaware Avenues. According to the 2000 United States census, the CDP has a total area of , all land.