"The big takeaway from the 2018 census test is that all of our systems deployed and integrated effectively," Albert E. Fontenot, Jr., associate director for decennial census programs said Monday.

The list, which the GAO publishes every two years at the start of a new Congress, puts particular attention on the process for security clearances — an issue the agency first raised separately in 2018.

Enzi wants to know about the Bureau's back-up plans in case of a cyberattack, among other things.

The Census Bureau plans to use GIS-enabled tools to find where citizens live, encourage them to respond to the census and record their responses.

"The Bureau continues to face significant challenges and risks in its efforts to manage the schedules, contracts, costs, and cybersecurity of its 2020 Census systems."

With the bureau preparing to make signification leaps in its technology for the 2020 count, agency officials are seeking to allay concerns about how citizen data will be protected.