New York State Property Assessment Rolls for 4.7 Million Parcels

4.7 million property parcels are detailed in assessment rolls submitted by 996 local governments to New York State. The dataset includes assessed value, full market value, property size, owner, and exemption information for all cities and towns except New York City. A unique property identifier can be created by combining the SWIS code and print key fields.

Use Cases

• Analyze assessed value versus full market value across 996 municipalities to identify assessment disparities.
• Model property size as a predictor of full market value for residential and commercial parcels.
• Identify exemption patterns by property type and owner to study tax relief program impacts.
• Geocode parcels using location data to map property value distributions across New York State.

Strengths

• Covers 4.7 million property parcels, providing a near-complete inventory of real estate in New York State.
• Aggregates data from 996 distinct local government assessment rolls, ensuring granular municipal coverage.
• Includes key valuation fields like assessed value and full market value for direct financial analysis.

Limitations

• Excludes all property data from New York City, a major economic center within the state.
• Data structure and specific column names are not documented, complicating initial analysis.
• Potential for inconsistency exists as data is compiled from hundreds of independent local sources.

Provenance

Source

State of New York, Department of Taxation and Finance – Office of Real Property Tax Services.

Collection Method

Compiled from final assessment rolls submitted by 996 local governments.

Time Range

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Freshness

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Geography

New York State, excluding New York City.