Integrated Tax System Public Extract: Washington D.C. Property Tax Data

District of Columbia property tax assessment data used for sending tax bills and property analysis. The dataset includes information on ownership, mailing addresses, and various lot types such as tax lots, condominiums, and federally owned lands. It was last updated on March 25, 2026, and is provided by the District of Columbia government.

Use Cases

• Assess property tax revenue based on ownership and lot type information
• Analyze land use patterns based on data for condominiums, air rights lots, and federally owned lands
• Link property records to geographic features using the SSL (Square, Suffix, Lot) linkage mentioned in the description
• Identify non-standard property relationships, such as tax lots created from underlying record lots

Strengths

• Data is explicitly linked to Vector Property layers via SSL (Square, Suffix, Lot) identifiers.
• Covers multiple complex property types including Air Rights lots, possessory interest lots, and condominiums.
• Available in multiple formats including CSV, GEOJSON, and via an ArcGIS REST API.
• Released under a permissive CC-BY-4.0 license.

Limitations

• Row count is unknown, which may limit suitability assessment.
• Column-level documentation is absent; field semantics must be inferred after download.
• The description notes not all record lots have a direct 1:1 relationship with the database, which may complicate joins.

Provenance

Source

District of Columbia government

Freshness

Last updated 2026-03-25 08:10:11.967646; freshness should be verified.

Geography

Washington D.C., District of Columbia