The Census Bureau recognizes a range of sociodemographic and other groups as hard-to-count. The following persons, many served or engaged by nonprofits, are at risk of being undercounted in the 2020 census. These individuals are considered hard-to-locate; hard-to-contact; hard-to-persuade; and/or hard-to-interview.

• Complex households including those with blended families, multi-generations, or non-relatives
• Cultural and linguistic minorities
• Displaced persons affected by a disaster
• Lesbian gay bisexual transgender queer/questioning persons
• Low income persons
• Persons experiencing homelessness
• Persons less likely to use the Internet and others without Internet access
• Persons residing in places difficult for enumerators to access, such as buildings with strict doormen, gated communities, and basement apartments
• Persons residing in rural or geographically isolated areas
• Persons who do not live in traditional housing
• Persons who do not speak English fluently (or have limited English proficiency)
• Persons who have distrust in the government
• Persons with mental and/or physical disabilities
• Persons without a high school diploma
• Racial and ethnic minorities
• Renters
• Undocumented immigrants (or recent immigrants)
• Young children
• Young, mobile persons