If you provided an answer to one of the security questions during your initial login, you can reset your PIN if lost or forgotten. Enter your User ID at https://respond.census.gov/acs and select the "Click here if you do not know your PIN" link. If you have lost or misplaced your User ID, please call 1-800-354-7271 for assistance. We're available Monday through Saturday 9:00 AM to midnight, eastern time, or Sunday from noon to midnight. Press '0' to speak with a U.S. Census Bureau representative. Please have your mailing address available.