Those gutless microorganisms. Bacteria are much larger than viruses. They range in size from 1 micron to 200 microns. A good place to see the difference in sizes can be found at Cells alive . There you can see that bacteria are about 10 times bigger than viruses.
Bacteria are still quite small and require the aid of a microscope to see the individual organisms.
There can be up to one billion cells in a colony. If you follow this link you can see plates containing colonies of cells. The small round dots are called colonies. Bacteria also come in a variety of shapes and sizes . Bacteria are found everywhere.