*Sinawava 312 (Las Vegas, NV) was originally listed as part of Area Y, before being reassigned to the new Area 12-A in 1946.
**this is an assumption based on Alaska being in Region 11.
References: Area Lodges and Area Leaders, July 1945 Bulletin of the Order of the Arrow
In September 1948, as part of the integration into the 12 Regions, the lodges of Area Y were reorganized as Region 11.
However, in 1949 these lodges (except for Nanuk 355, Shoshoni 363, Lemonti Lemooto 365, Navando Ikeu 407) met at Camp Black Mountain as Area Y.
Reference: Frank Dingwerth