Census Microdata API

Census Microdata API

May 14, 2026

You can find it in the API Discovery Tool for your dataset.

All data queries to the Census Data API now require an API key. Please cut and paste the Example Calls below into your web browser and replace YOUR_KEY_GOES_HERE with your personal API Key.

If you do not have an API Key, request one here. For more information: Watch Video.

VIUS

Vehicle Inventory and Use Survey Public Use File

2021 Vehicle Inventory and Use Survey

Example Call: api.census.gov/data/2021/viuspuf?tabulate=weight(TABWEIGHT)&col+BRAKES&row+AVGWEIGHT&for=state:*&FUELTYPE=20&key=YOUR_KEY_GOES_HERE
2021 Vehicle Inventory and Use Survey Variables, Examples, Supported Geography: api.census.gov/data/2021/viuspuf.html

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