011-9 Wyo. Code R. § 9-12
(a.) County Assessors shall have authority to assign identification numbers as well as ownership and LEA/NBHD boundaries for completion of county responsibilities for cadastral mapping. Plotting ownership entails researching title records and delineating the lands owned by each individual on ownership base maps. Ownership base maps shall consist of: Mylar overlays, other hard copy maps, or computerized mapping system. Application of parcel identification numbers and maps shall be constructed to meet the general standards of Department of Revenue's Mapping and Agricultural Manual, IAAO Standards on Manual Cadastral Maps (2004) and Parcel Identifiers or Standard on Digital Cadastral Maps and Parcel Identifiers (2003) or other methods/systems approved by the Department.
(b.) The Property Tax Division shall assure that all tax district boundaries in the state of Wyoming are plotted on a uniform set of tax district maps that can be easily reproduced and distributed. When these tax district maps are complete, each County Assessor shall, with the assistance of the taxing bodies, confirm the tax district boundaries in accordance with W.S. 39-13-102(p).
(c.) All parcels plotted on the base ownership maps and assigned a parcel identification number, as described in Subsection (a), shall have a corresponding State mainframe CAMA file. Each of these newly assigned parcel identification numbers (PINs) shall be entered into the corresponding and proper CAMA file.
(d.) Requests for variances from Department of Revenue's Mapping and Agricultural Manual shall be made to the Department in writing. Within sixty (60) days of receipt of the request, the Department shall obtain the recommendation of the Property Tax Division on the variance request and either approve, disapprove or conditionally approve the request. Notice of the decision on the variance shall be provided to all County Assessors.
011-9 Wyo. Code R. § 9-12