The German Genealogy Group, a member of the Genealogy Federation of Long Island, has recently added a birth, marriage and death index for the Town of Oyster Bay to its website.
The birth and marriage index covers the years 1847-1849 and the death index covers the years 1847-1849 and 1881-1920. There are 285 birth records, 117 marriage records and 9,673 death records.
If you find a record of interest in the index, copies of the records can be ordered from the Town of Oyster Bay for $22 per record. Instructions on ordering copies of the records can by found by using the links below:
birth records: https://www.germangenealogygroup.com/records-search/births_OysterBay.php
marriage records: https://www.germangenealogygroup.com/records-search/marriages_OysterBay.php
death records: https://www.germangenealogygroup.com/records-search/deaths_OysterBay.php