Accurate and high-quality data about Deaf or hard-of-hearing individuals and families are crucial for guiding research on Deafness, shaping policy for educational and employment support, enforcing civil rights protections, and providing resources for civic engagement. However, the Census Bureau undercounts and underrepresents Deaf or hard-of-hearing people, and fails to collect data about the use of their primary languages—American Sign Language and other signed languages. This fact sheet highlights several key data concerns and offers recommendations to improve engagement with Deaf and hard-of-hearing people and collect complete and accurate data.