For paper checks sent within the United States via:

Checks payable to Seattle International Foundation (SIF)
1601 5th Avenue, Suite 1900
Seattle, WA 98101

US Post Office
LB# 1069
Seattle Foundation
PO BOX 35146
Seattle, WA 98124-5146

Express Courier
LOCKBOX SERVICES #1069
Seattle Foundation
18035 Sperry Drive
Tukwila, WA 98188

If you are outside the United States, please