Zip Code 12834 is located in the state of New York in the Albany - Schenectady - Troy metro area. Zip code 12834 is primarily located in Washington County. The official US Postal Service name for 12834 is GREENWICH, New York. Portions of zip code 12834 are contained within or border the city limits of Greenwich, NY, Schuylerville, NY, . The area code for zip code 12834 is 518.