Is rent considered ordinary income

Yes it is taxed as ordinary income and the net rental income is reported on page 1 line 17 of the 1040 tax form.

Your net rental income is added to all of your other gross worldwide income and taxed as ordinary income at your marginal tax rate on your 1040 income tax return.

Your gross passive rental income and expenses are reported on the schedule E of the 1040 tax form.

Nonpasive gross rental income and expenses are reported on the schedule C of the 1040 tax form.

The difference is that you do not need to pay Social Security on Rental Income.