Getting a Marriage-Based Green Card is one of the most popular paths to becoming a permanent resident of the United States. If you’re married to a U.S. citizen or green card holder, you're likely eligible—but the process can be confusing at first. This complete 2025 guide will walk you through every step of applying for a Marriage-Based Green Card, including what forms to file, what documents to include, how much it costs, and how to avoid delays.