IAAO works with a number of industry groups who have a connection to the appraisal/assessment world. The following are a list of some of the groups IAAO works with.
- American Society of Appraisers (ASA)
- Appraisal Institute (AI)
- Australian Property Institute (API)
- Coalition of Geospatial Organizations (COGO)
- International City/County Management Association (ICMA)
- International Property Tax Institute (IPTI)
- Institute of Revenues, Rating and Valuation (IRRV)
- Korea Association of Property Appraisers (KAPA)
- Lincoln Institute of Land Policy
- National Association of Counties (NACo)
- National League of Cities (NLC)
- Royal Institution of Chartered Surveyors (RICS)
- The European Group of Valuers’ Associations (Tegova)
- The Appraisal Foundation (TAF)
- Valuation Office Agency (VOA)
- World Bank