So what type of tourist are you proposing to count? Only the ones from the US or from another countries? How do you plan on counting someone visiting multiple towns, counties, states? Do they get counted in each one?
The census should count everyone living in the US and where they get counted is at their permanent address. I would be curious if ex-pats are counted and how.

Regardless of legal status, Emergency services and Infrastructure need to be in place - these are dependent on the total numbers of people, not just citizens.
Thinking you can stop all undocumented people from being in this country makes as much sense as believing in God.

And cats!

Because we're all Americans at heart?
Or because all Americans are earthlings?

Agree, we have to count everybody, citizens and residents. If you live in this nation, you answer basic questions. Freedom is not without laws and responsibility.

The Census is used for determining a whole bunch of things. The number of representatives in Congress is just one. The amount of tax dollars that come back to your community is also based on the Census. Those tax dollars that come back to your community supports your local schools and hospitals.