Overview
A "List of United States cities by population" ordinarily orders incorporated places in the United States by the number of residents within their legal boundaries. Such lists rely primarily on data from the U.S. Census Bureau and related population estimates and are used to compare the sizes of places that are formally recognized as cities, towns, villages, boroughs, or similar entities. Well-known large examples frequently cited at the top of these lists include New York City, Los Angeles, and Chicago, though rankings change over time as populations shift.
Definitions and types of places
Official compilations are based on the concept of an incorporated place, a legal entity created under state law with defined boundaries and usually an organized government. The federal agency that standardizes these classifications is the United States Census Bureau, which clarifies terminology and reporting practices. In the U.S., incorporated entities may carry different local names; for example, many jurisdictions use the words city, town, village, borough, or municipality to describe comparable types of places.
Not all populated concentrations are incorporated. The Census Bureau also identifies some densely settled communities as census-designated places (CDPs), which lack separate municipal governments but are treated like places for statistical purposes. Another special arrangement is the consolidated city–county, where a city and county governments have merged; when such consolidations contain other incorporated places, published lists often report the population of the consolidated entity’s balance—the portion not within another incorporated place.
How these lists are compiled
Most contemporary lists rely on decennial census counts and on intercensal estimates produced by the Census Bureau and other agencies. The geographic unit used is the incorporated place’s legally defined boundary at the time of the count. Because legal boundaries change through annexation, incorporation, or disincorporation, a place’s rank can shift even without local population change. Annual estimates smooth short-term fluctuations, while the decennial census is the definitive count used for many official purposes.
Uses and common limitations
Lists of cities by population are useful for urban planning, public policy, funding allocations, and general comparison. However, they have important limitations. A city’s population within its legal limits is different from the population of its surrounding metropolitan area or urbanized area, which may include many suburbs and separate municipalities. For broader economic or labor-market analyses, metropolitan statistical areas (MSAs) or urban agglomerations are often more informative than incorporated-place lists.
Practical notes, distinctions, and notable facts
- Independent cities: A few U.S. cities are independent of any county (notably in Virginia); they are counted separately from surrounding counties in place lists.
- Consolidated governments: When a city and county consolidate, published lists may show the consolidated entity or the balance that excludes other incorporated places within it.
- CDPs and special cases: Some large population centers are CDPs rather than incorporated; whether to include them depends on the list’s criteria.
When using or interpreting a "List of United States cities by population," check the underlying definitions and data vintage: whether figures reflect the decennial census or an estimate, whether the unit is an incorporated place or part of a consolidated government, and whether CDPs are included. For official definitions and further methodological notes, consult resources produced by the Census Bureau and summaries about population geography in the United States context. Additional background on place names and classifications can be found via links explaining the various local terms (city/town/village/borough), the general concept of an incorporated place, how CDPs are handled (CDPs), and issues arising with merged governments (consolidated city-counties).