From the Introduction: "In a March 18, 2020, press release (CB20-RTQ.08), U.S. Census Bureau Director Steven Dillingham announced that the bureau was suspending all 2020 census field operations until April 1 (but see the more detailed schedule, issued on March 21, below). This action, a response to the novel coronavirus disease first observed in 2019 (COVID-19) and designated a pandemic by the World Health Organization on March 11, 2020, came at a critical time for the census. Although April 1 is the official Census Day, early data collection began in remote Toksook Bay, Alaska, on January 21. Other tightly timed field operations were underway or imminent, including the bureau's personal outreach to hard-to-count areas and groups. In-person visits to nonresponding households, originally set for mid-May, have been delayed by two weeks. Dr. Dillingham stated on March 18 that if 'additional adjustments' became necessary, the bureau would communicate them 'broadly and promptly.' The latest press release on the topic, dated March 28 (CB20-RTQ.14), announced an extended suspension of field operations, until April 15. The release did not present another revised schedule for the individual operations, but noted that the bureau 'continues to evaluate' them and 'will communicate any further updates as soon as possible.' This In Focus notes the various components of the bureau's 2020 census fieldwork, with their original and, as of March 21, adjusted schedules. Whether the bureau will have to make further adjustments in the timing of all, or some, components is uncertain. The In Focus will be updated to reflect any new delays or developments."
CRS In Focus, IF11486
Congressional Research Service: https://crsreports.congress.gov/