About the Large Jurisdiction Affinity Group
The Large Jurisdiction Affinity Group unites assessors from major counties to share strategies, address challenges, and advance fair, equitable, and innovative property assessment practices.
The Large Jurisdiction Group is a collaborative network of assessors representing some of the nation’s largest counties and municipalities. The group provides a forum for leaders in property assessment to share strategies, exchange best practices, and address the unique challenges that come with managing assessments in large, complex jurisdictions. Members come together to discuss emerging trends, including housing affordability, equitable assessments, technology innovations, fraud prevention, and evolving community needs.
By working together, the Large Jurisdiction Group strengthens professional connections, informs policy discussions, and supports fair and transparent property valuation practices across diverse and rapidly changing markets.
This has been a group that has been gathering independently for around 10 years, and the new structure formalizes the group and all of its hard work.
2025 Leadership Team:
King County Assessor John Wilson – John.Wilson@kingcounty.gov
Cook County Assessor Fritz Kaegi – Fritz.Kaegi@cookcountyil.gov
LA County Assessor Jeff Prang – JPrang@assessor.lacounty.gov
Palm Beach County Property Appraiser Dorthy Jacks – DJacks@pbcpao.gov
Philadelphia Chief Assessment Officer James Aros Jr. – James.Aros.Jr@phila.gov
How to Join
Sign up for our mailing list. Membership is open to all IAAO members from larger jurisdictions.
Events & Programs
- Roundtable Discussions – share challenges unique to large jurisdictions (equity, housing affordability, commercial trends, fraud).
- Case Study Spotlights – present real-world examples of successful assessment practices or innovations.
- Joint Research Projects – collaborate on studies about property trends, AI applications, or office-to-residential conversions.
- Policy & Legislative Briefings – exchange updates on state or local policy impacts.
- Peer Problem – Solving Sessions – bring “live” issues to the group for input and solutions.
- Technology Demos – showcase new tools, such as remote sensing, AI, or modeling software.
- Professional Development – host training or invite guest experts.