The listing of zip codes below depict the area within the borders of the Barony of Fettburg. If you reside in one of these zip codes than the Barony of Fettburg would be your local branch of the Society for Creative Anachronism. The Barony of Fettburg is in the Principality of Cynagua in the West Kingdom.
| County | Town | Zip Code |
| San Joaquin | Acampo | 95220 |
| San Joaquin | Banta | 95304 |
| San Joaquin | Clements | 95227 |
| San Joaquin | Escalon | 95320 |
| San Joaquin | Farmington | 95230 |
| San Joaquin | French Camp | 95231 |
| San Joaquin | Holt | 95234 |
| San Joaquin | Lathrop | 95330 |
| San Joaquin | Linden | 95236 |
| San Joaquin | Lockeford | 95237 |
| San Joaquin | Lodi | 95240, 95241, 95242 |
| San Joaquin | Lyoth | 95296 |
| San Joaquin | Manteca | 95336, 95337 |
| San Joaquin | Morada | 95212 |
| San Joaquin | Mountain House | 95391 |
| San Joaquin | Ripon | 95366 |
| San Joaquin | Stockton | 95201, 95202, 95203, 95204, 95205, 95206, 95207, 95208, 95209, 95210, 95211, 95212, 95213, 95215, 95219, 95267, 95269, 95296, 95297 |
| San Joaquin | Thornton | 95686 |
| San Joaquin | Tracy | 95304, 95376, 95377, 95378, 95385, 95391 |
| San Joaquin | Vernalis | 95385 |
| San Joaquin | Victor | 95253 |
| San Joaquin | Woodbridge | 95258 |
| Stanislaus | Empire | 95319 |
| Stanislaus | Knights Ferry | 95361 |
| Stanislaus | Modesto | 95350, 95351, 95352, 95353, 95354, 95355, 95356, 95357, 95358, 95397 |
| Stanislaus | Oakdale | 95361 |
| Stanislaus | Riverbank | 95367 |
| Stanislaus | Salida | 95368 |
| Stanislaus | Valley Home | 95361 |
| Stanislaus | Waterford | 95386 |
