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Electron is an 18m orbital delivery rocket (14.5m+payload without the optional third stage).
Japan holds the record for the smallest rocket to reach orbit with the SS-520, which put a cubesat into orbit in 2018.
Its dimensions according to Wikipedia:
Height – 31 feet (9.54 meters)
Weight – 2.9 tons (2.6 metric tons)
Diameter – 20 inches (52 centimeters)
Payload to Low-Earth Orbit – ~9 lbs (4 kg)