Form I-765 – Application for Employment Authorization. No matter your interests and skills, there's a place for you in Middlesex County.We are writing to you because we believe you may have recent work activity and we need to know more about this work activity. By signing in or creating an account, some fields will auto-populate with your information. Middlesex County Employment Application. If you had active military service, Social Security may ask for your DD-214. Proof of unearned income (benefits award letter); Proof of resources (i.e. 190 Middlesex Turnpike. It is not illegal for an employer to ask you for your social security number (SSN). HOWEVER you are in no way obligated to provide your SSN.