Delaware County is located in the southern part of the state, separated from the state of Pennsylvania by the Delaware River. It is east of Binghamton and southwest of Albany. The county contains part of the Catskill Mountains. The County is within a region called the Southern Tier of New York State. Just a few hours North of New York City, it's long been a destination for weekends for those looking to getaway from New York City and is a popular for weekender homeowners looking for unique, affordable properties within driving distance of New York City.

Delaware County is adjacent to Ulster, Sullivan, Greene, Otsego, Schoharie, Broome and Chenango counties in New York and Wayne County in Pennsylvania.

Delaware County was named after Delaware River, it was formed in 1797 by combining portions of Otsego and Ulster Counties.

The county is about the size of Rhode Island, as diverse as a it is large with deep roots in a farming which remains a strong industry today.