I have a signing and need to confirm what you would put in the blank. Witness my hand and notarial seal at ______ in said county, the date aforesaid.
It depends on what state you are in and what the rest of the certificate says.
When I have any doubts about whether a certificate is correct for my state, I replace it with the appropriate short form certificate that is spelled out in my state’s law.
The statement requires you to insert the “city” where the document is being executed in said County. “Said County” refers to the state and county referenced above, in the opening paragraph(s) of the document.