| Australia |
Arboriculture Australia |
Associate Organization |
| Australia-Queensland |
Queensland Arboricultural Association Inc. |
Associate Organization |
| Austria |
ISA Austria Chapter |
Chapter |
| Brazil |
Sociedade Brasileira de Arborizacao Urbana |
Chapter |
| Belgium |
Belgian Arborist Association |
Associate Organization |
| Canada-Atlantic (New Brunswick, Nova Scotia, Prince Edward Island, & Newfoundland) |
ISA Atlantic Chapter |
Chapter |
| Canada (Ontario) |
ISA Ontario Chapter |
Chapter |
| Canada-Prairie (Alberta, Manitoba, Saskatchewan) |
ISA Prairie Chapter |
Chapter |
| Canada (Quebec) |
la Société internationale d’arboriculture |
Chapter |
| Colombia |
Asociación Colombiana de Arboricultura |
Associate Organization |
| Croatia |
Hrvatska udruga za arborikulturu (HUA) |
Associate Organization |
| Czech Republic |
Sekce péče o dřeviny |
Chapter |
| Denmark/Iceland |
Dansk Træplejeforening |
Chapter |
| Finland |
Suomen Puunhoidon Yhdistys ry |
Associate Organization |
| France |
Société Française d'Arboriculture |
Associate Organization |
| Germany |
ISA Germany Chapter |
Chapter |
| Hong Kong |
ISA Hong Kong Chapter |
Chapter |
| Italy |
Società Italiana di Arboricoltura |
Chapter |
| Japan |
Japan Arborists Association |
Associate Organization |
| Latvia |
Latvijas Kokkopju Arboristu Biedrība |
Associate Organization |
| Lithuania |
Lithuanian Arboricultural Center |
Associate Organization |
| Malaysia |
Malaysian Society of Arboriculture |
Associate Organization |
| Mexico |
Asociación Mexicana de Arboricultura |
Chapter |
| Netherlands (Dutch) |
Kring Praktiserende Boomverzorgers |
Chapter |
| New Zealand |
New Zealand Arboricultural Association |
Chapter |
| Norway |
Norsk Trepleieforum |
Chapter |
| Poland |
Federacja Arborystów Polskich |
Associate Organization |
| Singapore |
Singapore Arboriculture Society (SAS) |
Associate Organization |
| Slovak Republic |
ISA Slovensko - Slovak Republic |
Associate Organization |
| Spain |
La Asociación Española de Arboricultura |
Chapter |
| Sweden |
Svenska Trädföreningens |
Chapter |
| Switzerland |
Bund Schweizer Baumpflege |
Associate Organization |
| Taiwan |
Taiwan Arboriculture Society |
Associate Organization |
| United Kingdom/Ireland |
The Arboricultural Association |
Associate Organization |
| United States-Florida |
ISA Florida Chapter |
Chapter |
| United States-Illinois |
Illinois Arborist Association |
Chapter |
| United States-Indiana |
Indiana Arborist Association |
Chapter |
| United States-Iowa |
Iowa Arborist Association |
Associate Organization |
| United States-Kentucky |
Kentucky Arborists Association |
Chapter |
| United States-Michigan |
Arboriculture Society of Michigan |
Chapter |
| United States-Mid Atlantic (Washington, D.C., Maryland, Virginia, & West Virginia) |
Mid-Atlantic Chapter ISA |
Chapter |
| United States-Midwest (Kansas, Missouri, Nebraska, North Dakota, Oklahoma, & South Dakota) |
Midwestern Chapter ISA |
Chapter |
| United States-Minnesota |
Minnesota Society of Arboriculture |
Chapter |
| United States-New England (Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont) |
New England Chapter ISA |
Chapter |
| United States-New Jersey |
New Jersey Arborists |
Chapter |
| United States-New York |
The New York State Arborists |
Chapter |
| United States-Ohio |
Ohio Chapter ISA |
Chapter |
| United States-Pacific NW (Alaska, Idaho, Oregon, Washington) + British Columbia Canada |
Pacific Northwest ISA |
Chapter |
| United States-Pennsylvania and Delaware |
Penn-Del Chapter ISA |
Chapter |
| United States-Rocky Mountain (Colorado, Montana, New Mexico, & Wyoming) |
ISA Rocky Mountain Chapter |
Chapter |
| United States-Southern (Alabama, Arkansas, Georgia, Louisiana, Mississippi, North Carolina, Puerto Rico, South Carolina, Tennessee, Virgin Islands) |
Southern Chapter ISA |
Chapter |
| United States-Texas |
ISA Texas |
Chapter |
| United States-Utah |
Utah Community Forestry Council |
Chapter |
| United States-Wisconsin |
Wisconsin Arborist Association |
Chapter |
| United States-Western (Arizona, California, Hawaii, & Nevada) |
Western Chapter ISA |
Chapter |