Within Maine, real property data is maintained by the government organization responsible for assessing and collecting property tax for a given location. Organized towns and townships maintain authoritative data for their communities and may voluntarily submit these data to the Maine GeoLibrary Parcel Project. Maine Parcels Organized Towns and Maine Parcels Organized Towns Aux Data are the product of these voluntary submissions. Communities provide updates to Maine GeoLibrary on a non-regular basis, which affects the currency of Maine GeoLibrary parcels data. Another resource for real property transaction data is the County Registry of Deeds, although organized town data should very closely match registry information, except in the case of in-process property conveyance transactions.

To provide a statewide digital tax parcel dataset for Maine. Property maps are a fundamental base for many municipal activities. Although GIS parcels data cannot replace detailed ground surveys, the data can assist municipal officials with functions such as accurate property tax assessment, planning and zoning. Towns can link maps to an assessor's database and display local information. Officials can show tax-payers how proposed development or changes in municipal services and regulations may affect the community. In many towns, parcels data also helps to provide public notices, plan bus routes, and carry out other municipal services.

This dataset contains municipal parcels data along with previously developed parcel data acquired through the municipal grants project by Maine Library of Geographic Information (MLGI). Submission of the municipal grant recipient parcels data was guided by standards presented to the MLGI Board, May 21, 2005, "Standards for Digital Parcel Files" A date field FMUPDAT is attributed with the most recent update date. This dataset also contains municipal parcel data acquired through other sources, the data sets are differenciated by the item FMSCORG.