To work in Canada, you must have a Social Insurance Number. This is a nine-digit number that you will need to look for a joband to receive government benefits.Sometimes, you will hear people call it theSIN number. You can get a SIN application form through the Human Resources Development Canada Centre near you. These centres are run by the federal government.You can also get a form through your local immigrant-serving organization or from the post office, or you can download one from the Internet at www.hrdc-drhc.gc.ca/sin-nas.The SIN card will be sent to you in the mail.There is a small fee for processing the application.