Introduction
ATTOM Data is a national property data provider covering more than 160 million residential and commercial properties across the United States. The company aggregates real estate information from more than 3,000 U.S. counties and maintains a data warehouse containing over 70 billion rows of transactional-level data and more than 9,000 discrete data attributes. ATTOM distributes property records to lenders, insurers, real estate technology companies, investors, government agencies, and academic institutions through multiple delivery channels.
The platform serves organizations that need access to large-scale, validated property records and real estate analytics. Rather than operating as a consumer-facing application, ATTOM functions as a B2B data infrastructure provider, licensing information to other businesses that incorporate the data into their own products and systems.
What ATTOM Sells
ATTOM sells comprehensive property data covering residential and commercial real estate across the United States. The company offers its data through multiple delivery formats including property data APIs, bulk file downloads, cloud delivery via Snowflake, property reports, and email delivery. The Property Data API is a self-serving platform that returns data in JSON or XML formats using REST conventions, enabling developers to request information about individual properties or geographic areas on demand.
ATTOM also sells specialized data products including an automated valuation model (AVM) for property purchases and sales, a rental AVM for estimating monthly rental values, foreclosure filings and deeds, mortgage data, property tax and assessment records, natural hazard and environmental risk data, school boundary data, and neighborhood demographic information. The company acquired Estated in 2024, integrating that platform’s parcel boundary and geospatial data into its broader product suite.
Key Features
Data coverage spans 99 percent of the U.S. population across all 50 states, with information on over 160 million properties. The dataset includes approximately 9,000 data attributes per property, encompassing property characteristics (square footage, lot size, construction year), ownership information, deed and mortgage records, sales history going back 10 years, property tax assessments, foreclosure filings, neighborhood demographics, school ratings for approximately 127,000 schools, boundary data (parcel, school district, and neighborhood), environmental hazard information (flood, wildfire, drought risk), points of interest (POI) data covering over 120 business categories, and climate change risk assessments.
ATTOM’s rental AVM covers over 72 million single-family residences and delivers monthly updates of estimated rental values with high and low ranges. The standard AVM covers single-family homes, condominiums, and small multifamily properties (one to four units) using multiple valuation models, geographic comparable properties, and confidence scores. Sales trends and some neighborhood boundary data update quarterly, while core assessor and deed data receive updates based on county record release cycles. The API connects directly to ATTOM’s data warehouse and receives weekly data releases.
Data sources include county public records (assessor records, deed recordings, mortgage filings), multiple listing services, third-party data providers, and proprietary ATTOM algorithms. The company applies a 20-step Enterprise Data Management Program (EDMP) that standardizes and validates data across disparate county sources and assigns each property a persistent ATTOM ID for tracking records across datasets.
Pricing and Tiers
ATTOM does not publish public pricing for most of its data products. When searching their website to write this article, the company listed pricing options only for its Property Navigator tool, with a Professional plan at $499 per year and Enterprise plans requiring custom quotes. The company states that pricing for bulk data licensing, cloud delivery, and API access depends on individual customer needs and use cases. ATTOM offers a 30-day free trial for the Property API and a 7-day trial for the Property Navigator tool. According to available sources, API pricing typically scales based on the number of monthly transactions, dataset coverage, and update frequency, with basic access reported to start around $500 per month for some use cases, though pricing varies considerably by customer and delivery method.
Pros and Cons
Pros:
- Coverage breadth: data on 160M+ properties across 50 states covering 99% of U.S. population
- Large attribute set: 9,000+ discrete data attributes per property enabling detailed analysis
- Data validation: rigorous 20-step EDMP standardizes records from disparate county sources
- Multiple delivery formats: API, bulk files, cloud integration, and reports accommodate different workflows
- Rental AVM: monthly-updated rental value estimates cover 72M+ properties nationwide
- 10-year sales history: enables historical trend analysis and longitudinal tracking
- Enterprise-focused: designed for institutional customers requiring reliable, validated data at scale
- Established track record: long operational history and customer base across multiple industries
Cons:
- High pricing: custom-quoted and enterprise-focused, limiting accessibility for smaller organizations
- No transparent pricing: public pricing information is minimal; most quotes require vendor contact
- Complexity: large attribute set and multiple delivery options require careful evaluation and integration planning
- Data consistency varies by county: coverage depth and update frequency depend on county public records practices
- Limited rental coverage: rental AVM focuses on single-family and condos, not multifamily apartments
- API learning curve: comprehensive but complex endpoint structure requires developer resources
Alternatives
- Dwellsy IQ sells unit-level rental data sourced directly from property management software, covering single-family and multifamily residential and commercial properties across multiple markets. The company normalizes rental data across geographies and provides analytics for pricing engines, underwriting, portfolio monitoring, and research.
- CoreLogic provides property information, analytics, and data-enabled solutions covering 99.9% of U.S. property records with over 140 million geo-coded parcel maps. The company offers property characteristics, market trends, risk assessment, and valuations, serving real estate, mortgage, insurance, and capital markets sectors.
- Black Knight supplies software, data, and analytics for mortgage and real estate professionals, with property data covering 99.9% of the U.S. population sourced from county assessors’ offices. The company specializes in mortgage industry solutions and maintains a database of approximately 150 million first mortgages alongside property records.
- Zillow offers property valuations, historical sales data, neighborhood details, and the Zestimate AVM for around 100 million properties through its bridge MLS platform and property detail APIs. The company provides free and paid access tiers for property records and market analysis.
- HouseCanary delivers precise automated valuation models, rental valuations, and block-level risk assessments for 136 million+ properties. The platform combines property characteristics, transaction history, and risk data to support real estate investment analysis and market research.
FAQ
Q: How frequently does ATTOM update its property data?
ATTOM updates data on varying schedules depending on the data type. Core assessor and deed records follow county release cycles, sales trends and school boundary data update quarterly, and rental AVM estimates receive monthly updates. The API receives weekly data releases connecting to ATTOM’s central data warehouse.
Q: What is the difference between ATTOM’s standard AVM and rental AVM?
ATTOM’s standard AVM estimates the market value of properties using comparable sales, primarily for single-family homes, condominiums, and small multifamily buildings. The rental AVM estimates monthly rental income potential using property characteristics, neighborhood factors, and rental market comparables, covering approximately 72 million single-family residences and condominiums.
Q: Can I access ATTOM data without an API integration?
Yes. ATTOM offers multiple delivery formats including bulk file downloads, cloud delivery via Snowflake, property reports for individual properties, and email delivery. API integration is one option but not required for all use cases.
Q: Does ATTOM cover commercial real estate?
ATTOM covers both residential and commercial properties within its dataset of 160+ million properties. The standard AVM product, however, focuses on single-family and small multifamily buildings. Commercial property valuations and specialized commercial data may require different products or custom solutions.
Q: How does ATTOM ensure data accuracy across different counties?
ATTOM applies its 20-step Enterprise Data Management Program (EDMP) to standardize and validate data from various county sources. The program assigns each property a persistent ATTOM ID that tracks the property across multiple datasets and sources, reducing data quality issues from inconsistent county record formats.
