Contact Us

Questions and Concerns

ISA is dedicated to providing quality customer service. Our customer service team looks forward to assisting you with your service needs, so please contact our office by clicking this link to email us or by calling +1.678.367.0981.

Headquarters Address

International Society of Arboriculture
270 Peachtree Street NW
Suite 1900
Atlanta, Georgia 30303
United States

Mailing Address

International Society of Arboriculture
P.O. Box 191
Annapolis Junction, MD 20701
United States

Phone and Fax

Toll Free: 1.888.472.8733 (US and Canada)
Phone: +1.678.367.0981
FAX: +1.240.547.1795

Hours of Business

Monday through Friday
8 a.m. to 5 p.m. (Eastern Standard Time)

Periodically throughout the year the office is closed for holidays. Closure announcements can be found below.


January 1 New Year's Day
January 17 Martin Luther King, Jr. Day
February 21 Presidents' Day
May 27 Memorial Day
June 20 Juneteeth
July 4 Independence Day 
September 5 Labor Day 
October 10 Columbus Day
November 11 Veterans Day
November 24-25 Thanksgiving Holiday 
December 23 - January 1 Winter Holiday (Christmas and New Year)