West Haven-Sylvan is a census-designated place (CDP) in Washington and Multnomah counties, Oregon, United States, north of U.S. Route 26.

In 1850, Nathan B. Jones, a pioneer of 1847, settled at the head of Tanner Creek and platted lots for a community he called "Zion Town".

[5] It is unknown if he named the place for Mount Zion, a summit located about a mile to the southeast.

[5] Jones, who was considered an eccentric hermit, had wanted Zion Town to become the new capitol of Oregon.

[5] Sylvan post office was located at what today is the interchange of Sunset Highway, Scholls Ferry Road and Skyline Boulevard within the Portland city limits in Multnomah County.

[6] According to the United States Census Bureau, the CDP has a total area of 2.3 square miles (6.0 km2), all land.