From the north to south, the following communities and places are located on its shore:
- North of the border, in British Columbia:
- South of the border, in Washington State:
Blaine's Drayton Harbor opens into Semiahmoo Bay; the harbor is separated from the main body of the bay by Semiahmoo Spit. The Semiahmoo Resort is located on the spit.
The Washington State Department of Ecology classified the marine waters within Semiahmoo Bay, outside of Drayton Harbor, as extraordinary quality waters for (1) salmonid and other fish migration, rearing, and spawning; (2) clam, oyster, and mussel rearing and spawning; and (3) crustaceans and other shellfish (crabs, shrimp, crayfish, and scallops) rearing and spawning.
The Campbell River flows into Semiahmoo Bay on the Canadian side; California Creek and Dakota Creek flow into Drayton Harbor on the US side.
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