Unlike the procedures related to other immigration cases, the process to replace a lost green card is fairly simple and straightforward one. First things first, it is very important for you to understand that in order to live legally in the United States of America, you must always carry your green card with you. Therefore, if you have misplaced or lost it, you must immediately take necessary actions to get it replaced with a new one. Following is a step-by-step guide on how to go about it.