The following agencies and associations have worked with UNITY in a variety of ways, including co-hosting conferences and webinars and offering support for the UNITY City Network.
- American Psychological Association
- American Public Health Association
- Association of State and Territorial Health Officials
- California Violence Prevention Network (formerly the California Cities Gang Prevention Network)
- Center for the Study of Social Policy
- City of San Diego Commission on Gang Prevention and Intervention
- Children's Defense Fund
- Coaching Corps
- Coalition for Juvenile Justice
- Congressional Black Caucus Foundation
- Cure Violence
- Futures Without Violence
- Los Angeles Advancement Project
- Motivational Educational Entertainment Productions Inc. (MEE)
- National Alliance for Hispanic Health
- National Association of State Boards of Education
- National Association of County and City Health Officials
- National League of Cities Institute for Youth, Education and Families
- National Network of Hospital-Based Violence Intervention Programs
- National Survivors Network
- Reaching Out to Others Together (ROOT Inc).
- Safe States Alliance
- Violence Prevention Coalition of Greater Los Angeles