Negative search letter

A negative search for what?  And what searching have you done?  If a census.... what specific year?  Did you search by address?  What Name?  And Philadelphia changed boundaries several times..... so you can see your request, even if the domain of the federal authorities, has too many assumptions for anyone to issue such a letter.  No time period, no federal documents including census and possibly immigration, no voting records, no marriage or birth records, etc.

Thank you for posting your question to History Hub! 

For general information about National Archives policies regarding negative search letters, see https://www.archives.gov/research/immigration/dual-citizenship-faq 

If you are referring to the National Archives at Philadelphia, please see here for their contact information:  https://www.archives.gov/philadelphia 

We are not familiar with the policies of the city agencies and state courts in Philadelphia in regards to negative search records. If you are referring to records held at the local level, we suggest contacting the relevant organization for assistance:  

• https://www.phila.gov/departments/ 
• https://www.phila.gov/departments/department-of-records/city-archives/ 
• https://www.courts.phila.gov/ 

We hope this is helpful with your research!