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Boundaries Data

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Visual Mapping of Boundary Data Brings Clarity to Decisions

Enhance your business processes with highly accurate location information for various map-oriented applications including listing portals, research tools, business intelligence mapping, public safety, and demographic applications. ATTOM has the most extensive boundary data for more than 155 million properties nationwide with flexible delivery solutions, such as APIs, bulk files, match & append, and more.

ATTOM’s Spatial Boundary Data Is Second to None

ATTOM has the largest database of spatial data for access to area and neighborhood boundaries. It starts with a hierarchy of macro-neighborhoods, neighborhoods, and sub-neighborhoods. The data is defined by multiple authoritative sources such as local government, real estate, tourism, local media, and customer feedback.

Parcel Boundary Data

Parcel boundary data includes all the properties within a county updated as property boundaries are split, combined, or modified. Parcel boundary data is sourced using geographical information systems (GIS).

School Attendance Areas

Define the area within which students are assigned to regular, neighborhood schools based on their location of residence.  These are researched and hand-digitized by our in-house GIS Team.

School District Boundaries

Define the area within which a school district is financially responsible for the education of resident students.  These are researched and hand-digitized by our in-house GIS Team.

Neighborhood Boundaries

This is a multi-level, hierarchical product with boundaries and names which reflect the consensus opinion of local residents.  These are researched and hand-digitized by our in-house GIS Team.

Residential Subdivisions

This product contains boundaries for purely residential areas, including subdivisions, condos, townhomes, and apartments. These are researched and hand-digitized by our in-house GIS Team.

Census Boundaries

This dataset includes State, County, County Subdivision, Place, Tract, Block Group, Core Based Statistical Area, and other boundary layers.

Postal Boundaries

Zip Code and Postal City Boundaries are researched and hand-digitized by our GIS Team using information from the United States Postal Service.

Canadian Boundaries

This dataset includes Neighborhoods, Residential, Parcels, and Census Boundaries for Canada.

Flood Zones

A geospatial database that contains current effective flood hazard data. FEMA provides flood hazard data to support the National Flood Insurance Program and to add transparency to flood risk and types of flooding.

How Can You Use ATTOM’s Boundaries Data?

Distressed Property Owners

Real Estate

Create online maps of neighborhoods and school zones.
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Financial Services


Use data to determine when and if school and educational institution boundaries need to be altered to accommodate changing populations and markets.
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Financial Services


Understand the demographics of residential areas and assess the population and neighborhoods to target.
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New Borrowers


Use geographic data on natural hazards for an accurate risk assessment.
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ATTOM’s Data is Your Business Advantage



A multi-sourced, enhanced national warehouse that contains information on more than 155 million U.S. properties including:

  • 29.6 Billion Rows of Data
  • 9,000 Data Fields
  • 20TB Warehouse
  • 99% Population Coverage

Quality Data

Our rigorous Enterprise Data Management Program (EDMP) involves more than 20 steps that validate, standardize and enhance the real estate data we collect:

  • Property Address Standardization
  • Owner Name Parsing
  • ATTOM ID Matching
  • Fusion of Multi-Sourced Data
  • Data Governance

Learn more about ATTOM and view our Table of Data Elements.

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