National Zoning Atlas

National Zoning Atlas

Make land use data accessible to increase the supply of affordable housing

“When we put it on a map, it was undeniable. [The Montana state legislature] had to face facts and admit that what their zoning code represents is not conducive to building all the homes they’re going to need.” 

– National Zoning Atlas Map User

A woman and a man talk in front of a computer

Location: United States

Across much of the United States, zoning laws — the regulations that dictate what can be built and how land can be used — only allow for single-family homes, preventing the development of denser housing like apartment buildings. This dramatically decreases the amount of housing available and increases home prices and rent.[55,56]

Despite zoning’s importance, information on zoning policies is largely inaccessible to the public.

The National Zoning Atlas (NZA), a project of the nonprofit Land Use Atlas, creates tools for advocates and policymakers. Its interactive map, which aims to cover over 33,000 jurisdictions in the United States, allows users to see their local zoning laws and statewide regulations.

To ensure data is actionable, the NZA publishes insights from their analysis and works with advocates to support local outreach.

The NZA recently released a report[1] showing that New York City could lose almost 20,000 units of housing due to flooding and needs to double the current zoning capacity to meet housing demands as a result.

In Montana, a bipartisan coalition used NZA tools to convince the state legislature to pass reforms to increase the supply of multifamily housing units and thus increase affordable housing.

In Texas, advocates used NZA data to pass statewide legislation expanding zoning for manufactured housing, one of the most affordable housing types.

Learn more: https://www.zoningatlas.org/Le

More ways to help

In Texas, West Street Recovery uses participatory research methods to release reports and advocate for better disaster resilience policy. Lower Sioux Indian Community Hempcrete Program and Housing Project, Rural Homes, and Build Up Nepal build affordable housing for their communities.

Notes

[1] Regional Plan Association, & National Zoning Atlas. (2025). Averting Crisis: Zoning to Create Resilient Homes for All. Regional Plan Association. https://rpa.org/work/reports/averting-crisis