Amazing that foreigners are represented in our government, but as long as the Census doesn’t ask...
The Constitution explicitly says that "representatives shall be apportioned among the several States according to their respective numbers, counting the whole number of persons in each State..." (14th Amendment, section 2). Nothing in there about only counting citizens. The very next sentence talks about "citizens of the United States" being eligible to vote for Congress, so they knew the difference between "citizens" and "persons" and clearly intended to have non-citizens counted for reapportionment even though they can't vote.