text: how do you address a chief of police in a letter? is it chief so and so, or mr. so and so, or  something else? use his name and title to address the envelope  for example  mr. tom s. justice chief of police city of philadelphia  does he have a title like sargent of any letters with periods after his name. be sure to know  but to play it safe,  just use a formal salutation in the letter like  dear mr. xxxx   or    dear sargemt xxxx  call the police receptionist and ask her how to address him if you want to be sure.