Temple De Hirsch Sinai (Wikipedia)Temple De Hirsch Sinai is a Reform Jewish congregation with campuses in Seattle and nearby Bellevue, Washington, USA. It was formed as a 1971 merger between the earlier Temple De Hirsch (Seattle, founded 1899) and Temple Sinai (Bellevue, founded 1961) and is the largest Reform congregation in the Pacific Northwest. The old Temple De Hirsch building (or Old Sanctuary) was listed on the National Register of Historic Places, but was demolished in 1993. Part of the façade remains.