Data notes

Trust comes
with footnotes.

Every City Atlas number should be understandable, repeatable, and attributed to its primary source.

Edition status

Census place release

This edition covers 3,219 Census places in the 50 states with at least 10,000 residents and a matching 2024 ACS place profile, ranked by the 2025 Population Estimates Program. Records are generated at build time by the project’s Census refresh script.

Primary sources

Public data at the foundation.

U.S. Census Bureau, American Community Survey
2020-2024 ACS 5-year Data Profiles provide age, income, housing, educational attainment, commute, and transportation measures for Census places.
U.S. Census Bureau, Population Estimates
2025 annual place estimates rank the current directory and provide population change. They are labeled separately from ACS survey estimates.
U.S. Census Bureau, TIGERweb
January 1, 2025 Census place boundaries provide land area, population density, and the static profile-boundary illustrations.
NOAA National Centers for Environmental Information
1991-2020 U.S. Climate Normals provide monthly temperature, precipitation, and snowfall averages from the nearest qualifying NOAA GHCN station.

Definitions

Comparisons require consistent terms.

“Place” means Census place geography. This release includes the 50 states and excludes the District of Columbia, Puerto Rico, and territories. “Median” is the midpoint of a distribution, not an average. Density uses 2025 Population Estimates divided by TIGERweb land area.

Limits

Useful data is not perfect data.

ACS values are survey estimates and should be read as a consistent comparison baseline rather than a measurement of any individual household. Climate normals come from the nearest qualifying NOAA station, so conditions may differ within a place.