There are two post offices in the parks. Outside Sequoia Park, about seven miles west of the entrance on Hwy 198 at Ash Mountain is the Three Rivers Post Office.
At Lodgepole Village:
The Post Office is located behind the main Lodgepole Visitor Center and Market. Hours are weekdays 8am-1pm & 2-4pm. 559-565-3678. Lobby with stamp machine open 24 hours. Address mail to visitors: c/o General Delivery, Sequoia National Park, CA 93262.
At Grant Grove Village:
The Post Office is north of the visitor center and gift shop in the same building as the market. Hours vary. Lobby & stamp machine 24 hours. Address visitor mail: c/o General Delivery, Kings Canyon NP, CA 93633. 1-559-335-2499.