Area U formed in 1943, consisted of lodges in CA/OR/AZ
- California lodges:
| Area U (as of 1942): |
| lodge |
| lodge |
- CA/OR/AZ:
| Area U (as of 1943): |
| lodge |
| lodge |
- CA & AZ (OR lodges joined Area Y):
| Area U (as of 1944): |
| text |
| text |
- Area U met for the first time in 1945:
| 90 Canali–o |
| 102 Mirimichi |
| 207 Stanford |
| 225 Tamet |
| 249 Spe-Le-Yai |
| 252 Siwinis |
| 278 Wehadkee |
| 282 Royaneh |
| 304 Cayucos (ch: 6/12/1945) sent reps? |
| Where in Area U, but did not attend in 1945: |
| 98 Navajo |
| 127 Tahquitz |
| 177 Victorio |
| 228 Walika |
| 262 Mow-A-Toc |
| 263 Swegedaigea |
| 291 Topa Topa |
| 298 San Gorgonio (ch: 1/2/1945) |
| 303 Yowlumne (ch: 6/11/1945) |
| 312 Sinawava (7/13/1945) |
Reference: Tracy Schultze Area Conference History for Area U and Area U, Section A
In 1946, Area U split into A and B:
- U-A had 12 lodges in southern CA/NV/AZ:
| Area U-A (1946-50): |
| 90 |
| 98 |
| 127 |
| 177 |
| 225 |
| 228 |
| 249 |
| 252 |
| 291 |
| 298 |
| 304 |
| 312 |
- U-B had 9 (+ 354 in 1947) lodges in northern, central CA:
| Area U-B (1946-48): |
| 102 |
| 207 |
| 262 |
| 263 |
| 278 |
| 282 |
| 303 |
| 342 (ch: 1946) |
| 346 (ch: 1946) |
| 354 (ch: 1947) |
U-A became Area 12-A (same 12 lodges) in 1951. In 1948, U-B split between 12-B (5 + 4 new that year) and 12-C (remaining 5).
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