Part Four: Finding Every Place Where People Live

Before Census can count everyone, it must know where to look. Most people live at an address that fits easily into a national list: a house, apartment, or other recognized housing unit. But many do not. People may live in converted garages, basement apartments, recreational vehicles, shelters, motels, encampments, college housing, correctional facilities, or other places that do not resemble a conventional home.

Finding these places is one of the census’s most basic responsibilities. A questionnaire cannot be mailed to a housing unit that is missing from the address list. An enumerator cannot visit a place Census does not know exists. A person living in group quarters or without conventional housing may be missed entirely if Census uses the wrong operation or looks in the wrong location.

These problems are not distributed evenly. Informal and recently created housing units are more common in communities facing high housing costs, overcrowding, displacement, or rapid growth. Rural and tribal areas may use addresses that do not fit standard street formats. People experiencing homelessness may move among shelters, outdoor locations, temporary arrangements, and other places that are difficult to capture on a fixed list.

The address and location systems also connect many of the operational changes discussed earlier in this guide. They determine who receives a self-response invitation, where fieldworkers are sent, how responses are matched to housing units, and whether administrative records appear to describe the correct household. As Census relies more heavily on linked records and in-office processing, an early mistake about a place can carry through multiple stages of the count.

This part examines how Census plans to identify housing units, group quarters, and other places where people live. It focuses on the procedures used to build and update the address list, the role of local and tribal knowledge, and the operations designed for people who cannot be counted through an ordinary household mailing.

The central question is simple: Does Census have a reliable way to find every place where people live, including places that are new, informal, temporary, unconventional, or easy to overlook?