The Halcyon Store & Post Office
936 South Halcyon Road Halcyon, CA 93420
Mailing Address: P.O. Box 7010, Halcyon, CA 93421
Email: halcyonstorepostoffice@gmail.com
Phone: (805) 489-2432
Store Hours: 9-5 Monday through Sunday.
The post office information is on USPS web page or call 1-800-275-8777 for all postal questions