body: This question is about a company that is a Delaware corporation but which does business in California (has offices there, and sells to customers there).
  
  
  If that company wanted to use a DBA, would the DBA need to be registered in Delaware, California, or both?
  
  
  Also, in which county/counties in each state should the DBA be registered?
  
  
  
title: Where to register a DBA (company Doing Business As) name?