How many ants are in the US?
There are about a dozen species that commonly are seen as pest problems in the home. There are many hundreds of species in the US, and therer are uncountable bazillions of individual ants. The most frequent invaders of homes are carpenter ants (about 6 types), odorous house ants, moisture ants, and fire ants. In the yard you will find all these plus thatching ants.