Knowing how and where to file an affidavit depends entirely on the exact purpose of the affidavit. Government agencies, legal offices, financial institutions, and businesses use affidavits. Depending on the type of affidavit and intended use, you may need to file the affidavit with the appropriate district or circuit court in your county or town. Suppose you have any questions determining whether you need to file or about filing an affidavit. In that case, you can obtain information from the government agency, legal professional, or organization you are working with and create this affidavit.