What happens if you ignore a Census questionnaire and/or worker's visits?

You risk not being counted in the census (I wasn’t counted in 2000 because neither my new husband nor my parents included me on their household questionnaire).

There are no individual-level repercussions for this… but population-level repercussions for undercounting census numbers include:
– less federal and state allocations, and any other funding source that is census-dependent
– improper statistics that use census data as denominators (of which there are MANY)
– potentially improper demographic/socio-economic statistics for your zone (which also impacts funding, as well as services provided, for your area)
– a higher presumed rate of vacant property (if you live alone)
– and many more.

You’re also costing the federal government money. They pay their census workers, as well as team leaders, supervisors and managers. The survey is simple enough… why ignore it?

Technically, you could be fined up to $5,000. But the Census Bureau almost never fines anyone, so what @Cupcake said covers the likely actual consequences.

@SavoirFaire Yes, thank you. That is far more correct.