1920 United States Census

Methods and scope

Field enumerators collected information on households using standardized schedules that asked about name, relationship, age, sex, race, nativity, occupation and other basic characteristics. Data processing combined manual tabulation with mechanical tabulating equipment that had been adopted earlier, allowing large volumes of material to be summarized and analyzed for national and state reports.

Key findings

Beyond the headline population figure and the 15% growth rate, the 1920 Census is widely noted for documenting a decisive shift toward urban living: for the first time a majority of the population was classified as living in urban places rather than rural areas. The returns also highlighted continuing immigration and internal migration patterns that reshaped regional population balances.

Uses and political impact

Census totals are used to apportion seats in the U.S. House of Representatives and to guide federal and state planning and funding decisions. The 1920 results prompted political controversy: many lawmakers resisted reapportionment changes suggested by the new figures, and Congress did not immediately enact a reapportionment that reflected the 1920 counts, a decision with lasting political consequences.

Legacy and research value

Historians, demographers and genealogists rely on the 1920 Census schedules and summary reports to study post‑World War I American society, urbanization, labor trends and immigration. The census stands as a key primary source for understanding the transitional decade of the 1910s and the policy debates that followed.

Notable facts

• The 1920 enumeration continued long‑standing census traditions while reflecting technological and organizational advances in data processing.
• Its documentation of urban majority marked a major demographic milestone in U.S. history.
• Researchers can consult official publications and archived schedules for detailed tables and regional breakdowns.