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About Census Data

Descriptions of data programs and concepts

American Community Survey (ACS)

The American Community Survey (ACS) is an ongoing survey that provides data every year -- giving communities the current information they need to plan investments and services. Information from the survey generates data that help determine how more than $400 billion in federal and state funds are distributed each year.

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Boundary and Annexation Survey (BAS)

Accurate boundaries are essential for accurate population counts. Every year the Census Bureau's Boundary and Annexation Survey (BAS) updates the nation's inventory of counties, townships, and incorporated places.

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Census Challenges

Governmental units may challenge the U.S. Census Bureau's population estimates and counts.

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Census of Agriculture

Every five years the census of agriculture provides comprehensive statistics about agricultural operations, production, operators, and land use.

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Census Tracts

Census tracts are small, relatively permanent statistical subdivisions of counties. Web look-up tools let you find census tract numbers for specific street addresses.

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Certified Census Counts

Population counts used for official purposes must be certified by the U.S. Census Bureau and the Iowa Secretary of State.

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New, Consolidated and Discontinued Cities

New, merged, and discontinued Iowa cities

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Congressional Apportionment

Apportionment is the process of dividing up the 435 seats in the House of Representatives among the 50 states according to population.

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Economic Census Programs

Every five years the Census Bureau's economic census provides comprehensive statistics about the structure and functioning of the nation's economy.

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Enterprise Zone Program

The Iowa enterprise zone program promotes new economic development by encouraging communities to target resources that attract productive private investment in economically distressed areas. The Iowa Department of Economic Development certifies eligible enterprise zones.

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Health Insurance Estimates

The Census Bureau produces annual estimates of health insurance coverage for the U.S. , states, and counties.

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Metropolitan, Micropolitan, and Combined Statistical Areas

Every ten years the U.S. Office of Management and Budget (OMB) updates the standards for defining metropolitan areas. A list of qualified metropolitan, micropolitan, and combined statistical areas is released by OMB every year based on new population estimates.

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North American Industry Classification System (NAICS)

NAICS is a system for classifying business establishments by type of economic activity to promote uniformity and comparability in the presentation and analysis of statistical data about the economy.

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Population Estimates

Every year the Census Bureau produces population estimates for states, counties, and incorporated places.

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Population Projections

Every ten years the Census Bureau produces population projections for states. The State Data Center also uses annual state and county projections produced by Woods & Poole Economics, Inc.

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Poverty Statistics, Thresholds, and Guidelines

Every year the Census Bureau produces poverty estimates for states, counties, and school districts.

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Race and Ethnicity Classifications

Race and ethnicity standards provide consistent and comparable data for an array of statistical and administrative programs, including census programs.

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Redistricting Data Program and Iowa Redistricting

Small-area census population counts are used in Iowa to draw new boundaries for precincts and for congressional, legislative, supervisor, ward, and school board director districts.

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Special Censuses

Local governments may ask the Census Bureau to conduct a special census in the years between decennial censuses. The certified results of a special census may be used to allocate state funds based on population.

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Urban and Rural Classifications

The Census Bureau uses urban area criteria to create a single set of rules that yield consistent data and eliminate subjectivity in the delineation of urban areas.

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What Is The Census?

The U.S. Constitution mandates a census every ten years to determine how many seats each state will have in the U.S. House of Representatives.

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last modified Jun 28, 2010 07:40 AM