RPTL §1590 requires that assessing units post their assessment rolls on their web site, or to provide a link to the county web site posting the roll. These rolls are updated on or around May 1st for Tentative Assessment Rolls, and on or around July 1 for Final Assessment Rolls.
Detailed parcel information can be found on Dutchess County’s Parcel/Access application which is also updated on or around May 1st, and again on or around July 1st.
RPTL §504 allows an assessor to make corrections to the tentative assessment roll after processing but prior to publication by filing a list of those corrections at the same time as the roll.
Please see NYS ORPTS' web page Overview of the Assessment Roll which will help you to understand the information contained in the roll.
Tentative 2013 Assessment Rolls
Towns / Villages