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There is no smallest (or larger) unit since a further prefix will provide a smaller (or larger) prefix. Amongst units with recognised prefices, the smallest is

yoctometre = 10-24 metres

zeptometre = 10-21 metres

attometre = 10-18 metres

femtometre = 10-15 metres

picometre = 10-12 metres

nanometre = 10-9 metres

micrometre = 10-6 metres

millimetre = 10-3 metres

centimetre = 10-2 metres

decimetre = 10-1 metres

metre

decametre = 101 metres

hectometre = 102 metres

kilometre = 103 metres

megametre = 106 metres

gigametre = 109 metres

terametre = 1012 metres

petametre = 1015 metres

exametre = 1018 metres

zettametre = 1021 metres

yottametre = 1024 metres


There are also units outside the SI system which are smaller. The smallest meaningful measure of length is a Planck length. There may be the largest unit, around 140 yotta metres, which is the size of the known universe, but I have not seen it used as a measurement unit.

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