We offer customized services to towns, allowing each municipal client to determine the extent of contract services they want, from database management to the full assessing functions of a sworn assessor.  O’Donnell’s CAMA (computer assisted mass appraisal) Software is utilized in over 30 towns.  Our staff members are also proficient in a variety of other software products, allowing us to integrate our services with pre-existing programs.  Competent field work to maintain inventories and careful monitoring of local and regional markets allow us to consistently assign defensible, fair values.


Assessing Clients 2021


A town-wide revaluation/equalization program is a commitment to fairness for all property owners.  The primary purpose is to re-establish equity in assessed values across all property types.  We have an outstanding record of achieving value results with excellent ratings by the Maine Revenue Services in their Assessment Standards Rating process.  By the end of 2021, we will have completed 97 equalization programs.

Revaluation Clients 2021


O’Donnell & Associates has continuously served the tax mapping needs of many New England towns since 1961. We provide annual up-dates to tax maps ranging from traditional ink on mylar sets to digital mapping integrated with Geographic Information Systems. Our staff have been reading deeds for decades; we offer familiarity, continuity, reasonable pricing and quality print products.

Tax Mapping Clients 2021

O’Donnell & Associates 2021 Tax Map Price List

O’Donnell & Associates 2021 Individual Prints Price List


O’Donnell & Associates CAMA (Computer Assisted Mass Appraisal) Software

Initially developed in 1994, O’Donnell & Associates Computer Assisted Mass Appraisal software is a Windows program written in Microsoft Access that sets the foundation for integrated assessment administration.  It has been fine-tuned with the direct participation of Maine Certified Assessors to meet Maine assessing requirements.  Robust relational databases allow assessors to create and maintain detailed inventory while establishing accurate value schedules tested by ratio analysis and sales comparisons. Our CAMA program is also designed to serve as an assessor’s document management system.

For towns using Harris Computer Systems TRIO software, O’Donnell’s CAMA offers a database extract designed for use with the O’Donnell/Trio interface available from Harris Computer Systems. The result is a seamless interface between the O’Donnell CAMA system and the TRIO Tax Billing module.

The State of Maine uses a custom version of the company’s Property Tax Manager Tax Billing and Collection system in the Unorganized Territory.  The collection system is customized to work with the Maine Image Processing System (MIPS).

Online Assessing Towns


O’Donnell & Associates offer specialty mapping, new digital tax mapping programs and digital conversion projects.

A growing number of clients are migrating to digital mapping or GIS.  We have finalized digital conversion projects for over a dozen towns.  We offer support to our clients as they transition to digital platforms.

Digital Map Samples