Tax Assessor Data

# Tax Assessor Property Data

## Overview

ATTOM’s **U.S. National Tax Assessor Data** is a comprehensive, standardized dataset delivering property assessment and tax information across the United States. Sourced from more than 3,000 county assessor offices, the dataset provides consistent, normalized assessment data for over 159 million residential, commercial, industrial, agricultural, and vacant properties nationwide.

## Coverage & Scale

- 159M+ properties nationwide
- Sourced from 3,000+ county assessor offices
- Residential, commercial, industrial, agricultural, and vacant property types
- Nationwide coverage with standardized schemas across all jurisdictions

## What the Dataset Includes

- Current and historical assessed values
- Property characteristics including square footage, lot size, year built, and building details
- Land attributes, improvement details, and land use classifications
- Zoning designations and valuation methodologies
- Tax amounts, tax years, exemptions, and assessment notes
- Consistent field definitions through ATTOM’s national normalization framework

## Data Quality & Validation

- Multi-step quality assurance checks
- Automated accuracy validations
- Cross-referenced with ATTOM deed, parcel, and boundary datasets
- Monthly refresh cycles to ensure current and reliable assessment data

## Delivery & Availability

- Updated monthly
- Delivered via Snowflake
- Nationwide coverage