ICAR Research Data Repository for Knowledge Management

This dataset, sourced from the United States Census Bureau, presents time series data at the county, ZCTA, and state levels. It includes a select number of variables from the American Community Survey (ACS) 1-Year Estimates, ACS 5-Year Estimates, and the Decennial Census (SF1). A key feature of this dataset is the harmonization of variable codes across the different years and surveys, ensuring consistency and comparability over time.

As a historical dataset designed for analysis, the cross year harmonization facilitates tracking changes over time and is useful for studies that look at long-term effects in areas like epidemiology, environmental health, and public policy.

The ACS 1-Year Estimates offer annual insights into current conditions, aiding timely analyses. The ACS 5-Year Estimates provide increased statistical reliability for analyzing smaller populations and areas by pooling data over five years. The Decennial Census, with datasets for 2000, 2010, and 2020 available through the Census API, gives a decadal population count, serving as a foundational element for longitudinal studies.