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  1. Dartmouth Libraries
  2. Research Guides
  3. Dartmouth Libraries Guides
  4. Census Data
  5. Estimates & Projections

Census Data

Every 10 years, the United States government is required to count all of its citizens. This is a guide to the Decenniel Census. The government not only tries to count all of us, but also gathers different types of data about all of us.
  • Introduction
  • The Basics
  • Decennial CensusToggle Dropdown
    • 2020 Census
    • 2010 Census
    • 2000 Census
  • American Community Survey
  • Questionnaires & more ...
  • CensusCD products
  • Census Data by ZIP Code
  • Historic Census Data
  • NHGIS
  • Online Census Data
  • TIGER Files
  • Mapping Census Data
  • PUMS
  • CPS
  • Estimates & Projections
  • International Data
  • Census Data & Genealogy
  • Understanding Census Geography
  • Census maps
  • ArcGIS for Excel
  • Geographic Information Systems
  • GIS Software & Manuals

Estimates

The Population Estimates Program publishes total resident population estimates and demographic components of change (births, deaths, and migration) each year. We also publish the estimates by demographic characteristics (age, sex, race, and Hispanic origin) for the nation, states, and counties. In addition to the resident population universe, we also produce population estimates for these universes: resident plus armed forces overseas, civilian, and civilian noninstitutionalized at the national level; and civilian at the state level. The reference date for estimates is July 1.

  • Population Estimates
    The Census Bureau's Population Estimates Program (PEP) produces estimates of the population for the United States, its states, counties, cities, and towns, as well as for the Commonwealth of Puerto Rico and its municipios.

Projections

Projections are estimates of the population for future dates. They illustrate plausible courses of future population change based on assumptions about future births, deaths, net international migration, and domestic migration. Projected numbers are typically based on an estimated population consistent with the most recent decennial census as enumerated, projected forward using a variant of the cohort-component method.

In some cases, several alternative series of projections are produced based on alternative assumptions for future fertility, life expectancy, net international migration, and (for state-level projections) state-to-state or domestic migration. For each of these components of population change--fertility, mortality and net migration--three different assumptions about the future are applied. The series using the middle assumption for each component--generally designated as the "middle series"--is the most commonly used. Population projections are produced by age, sex, race and Hispanic origin, and are released periodically.

  • Census Bureau logo
    Population Projections
    Population projections are estimates of the population for future dates. They are typically based on an estimated population consistent with the most recent decennial census and are produced using the cohort-component method.
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  • Last Updated: Feb 27, 2025 3:46 PM
  • URL: https://researchguides.dartmouth.edu/census
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Subjects: Multidisciplinary
Tags: ACS, American Community Survey, current_population_survey, estimates, international_data, projections, questionnaires, TIGER files

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