Data DictionaryPageIndex_Poly represents the bounds of the Snohomish County Assessor’s tax Parcel Maps and is used as the index layer in Esri’s Data Driven Pages tool to automate Parcel Map generation. PageIndex_Poly is maintained as part of the County’s Integrated Land Records database and is based on the Public Land Survey System representing Sections and Quarter Sections. It is derived from the PLSS_Poly dataset and regenerated every few years to keep up with increasing tax parcel density. At the time of generation, Section Maps are converted into Quarter Section Maps when the unstacked (flattened) tax parcel count is greater than or equal to 150 per section.

This data set is a compilation of tax code area boundaries in Snohomish County, Washington. Tax code areas are formed from a composite of special purpose district boundaries such as cities, fire districts, school districts, etc. Tax code areas represent areas with a uniform tax (levy) rate for that area. The boundaries of the present data set are compiled from data sets for many of the taxing districts that were compiled from legal descriptions for each annexation from the original incorporation onward. Legal descriptions were interpreted without assumption of intent or bias from any pre-existing maps. Spatial registration conforms to features in the Snohomish County parcel data set. For areas where special purpose district boundaries have not been converted, the boundaries were taken from a manually maintained atlas.