What is before a millimeter?

Answer 1

When you say "what is after", I assume you mean the next smallest. while a millimeter is 1x10-3 meters, the next smallest most commonly used unit of measure is the micrometer which is 1 x 10-6 meters.

Answer 2

Before a millimeter, the next smallest unit of measurement is a micrometer, which is equal to one thousandth of a millimeter.

Answer 3

From large to small: Meter, centimeter then millimeter.

Answer 4

centimeter

millimeter

micrometer

nanometer

pictometer

femtometer

attometer

yoctometer

plank length

Answer 5

KILOMETER