Key takeaways With nearly $200 billion in assets, Navy Federal is by far the largest credit union in the U.S. Most of the 10 largest credit unions restrict membership, but Pentagon Federal and Alliant are notable exceptions — anyone can join. Federal data shows that credit unions are growing steadily. While the top ten largest credit unions still hold significantly less in assets than even the top five largest banks, they have been growing considerably in recent years.  In under 6 years, total assets in federally insured credit unions have risen by over 48%, increasing from $1.64 trillion in March 2020 to $2.43 trillion in December 2025, according to the National Credit Union Administration (NCUA).…