Do you have questions on how to use Microdata Access? Check out our step-by-step guidance to learn how to use Microdata Access to create your own tabulations.

Using Microdata Access: With ACS 1-Year Estimates – Public Use Microdata Sample [1.5 MB]

Using Microdata Access: How To Create Poverty Estimates From The CPS ASEC [2.4 MB]

Featured Resource

Building a Custom Table Using MDAT

Watch this video to learn how to use Microdata Access (MDAT) through data.census.gov, and create customized tabulation.

Building a Custom Table Using MDAT

Watch this video to learn how to use Microdata Access (MDAT) through data.census.gov, and create customized tabulation.

Webinars

Taking the Guesswork Out of MDAT

Get a guided tour of the Census Bureau's Microdata Access Tool (MDAT) and learn how to create customized tables not available through data.census.gov.

Deep Diving into the Microdata Access Tool (MDAT)

In this workshop, we will go through some hands-on-exercises using the MDAT to customize our tabulations.

Using Public Microdata to Create Custom Tables on data.census.gov

In this webinar, you will learn how to create custom tables using public use microdata, customize your view, download the data, and provide your feedback.

View All Webinars

Video Tutorials

Video

Building a Custom Table Using MDAT

Watch this video to learn how to use Microdata Access (MDAT) through data.census.gov, and create customized tabulation.

Tutorial

What is Microdata and Why Should I Use It?

Microdata are a set of untabulated records about individual people or housing units that can be used to create custom tables.

Tutorial

Learn the First Steps to Creating Your Own Tabulation Using Microdata

In this Data Gem we will show you the first steps to creating your own tabulation using the Microdata Tabulation Tool at data.census.gov.

View All Census Videos

Data Availability

What data are available in the Microdata Access?

We continue to migrate data from DataFerrett. See a list of datasets currently available in the platform.

Transition from DataFerrett

DataFerrett was decommissioned and taken offline on June 30, 2020. Data previously available on DataFerrett are now being released on the U.S. Census Bureau's new dissemination platform, Microdata Access. Since we are a developing site, not all the data from DataFerrett have been migrated over to Microdata Access. Below is an overview of our data migration status that will be updated regularly.

DataFerrett Data Sets Coming Soon to Microdata Access

Decennial Census of Population and Housing

Dataset	Vintage	Until Then, Find It Here:
Public Use Microdata Sample - 1-Percent	2000	PUMS
Public Use Microdata Sample - 5-Percent	2000	PUMS
Public Use Microdata Sample - 10-Percent	2010	PUMS

Older Data Sets Not Available on Microdata Access

American Housing Survey

Dataset	Vintage	Find It Here:
Metropolitan Sample	1998 - 2004	AHS
National Records-1993	1993	AHS
National Records-1995	1995	AHS

Survey of Program Dynamics

Dataset	Vintage	Find It Here:
Cross-Sectional	1999 - 2002	SPD

Decennial Census of Population and Housing

Dataset	Vintage	Find It Here:
General	1880, 1910, 1920 1940, 1950, 1960	Historical Census Data from IPUMS
Free Population	1850
Free Population	1860
General	1870
General Sample - Minnesota	1900

National Survey of Fishing, Hunting, and Wildlife Associated Recreation

Dataset	Vintage	Find It Here:
Screening File	2001, 2006	FHWAR Datasets: 2001 and FHWAR Datasets: 2006
Sportsperson File	2001, 2006
Wildlife Watching File	2001, 2006

Decennial Public Use Microdata Samples

Dataset	Vintage	Find It Here:
One Percent Housing Records	1990	PUMS
One Percent Persons Records	1990	PUMS
5 Percent Persons Records	1990	PUMS

Data Dictionaries and Related Documentation

ACS PUMS Documentation

(Including Data Dictionaries)

Basic Monthly CPS Data Dictionaries

CPS Annual Social and Economic (CPS ASEC) Supplement Documentation

(Including Data Dictionaries)

CPS Supplement Documentation

(Including Data Dictionaries)

Census Microdata API User Guide

This user guide provides an overview of the U.S. Census Bureau’s microdata application programming interface (API) and walks through how to make queries.

Our Development Depends on Your Feedback

Take Action

As we continue to develop new functionalities like search by address and advanced printing and download options, please let us know what features are important to you.

Please send your questions or comments on data.census.gov, Census API, or Microdata Access to census.data@census.gov