He evidently removed to Dutchess County, New York with his brother, Isaac; he appears in the 1790 and 1800 censuses there next to his brother.
Sources
Merrick, George Byron, Genealogy of the Merrick-Mirick-Myrick family of Massachusetts, 1636-1902, page 26
"United States Census, 1790," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHKP-9DR : accessed 26 April 2021), David Merrick, Fredericksontown, Dutchess, New York, United States; citing p. 16, NARA microfilm publication M637, (Washington D.C.: National Archives and Records Administration, n.d.), roll 6; FHL microfilm 568,146.
"United States Census, 1800," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XH5T-4QR : accessed 26 April 2021), David Myrick, Carmel, Dutchess, New York, United States; citing p. 89, NARA microfilm publication M32, (Washington D.C.: National Archives and Records Administration, n.d.), roll 21; FHL microfilm 193,709.
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