Mercury has the fastest orbital velocity, at about 49 thousand kilometers per second.
Mercury: 48.651
Venus: 34.874
Earth: 29.663
Mars: 24.025
Jupiter: 13.012
Saturn: 9.604
Uranus: 6.749
Neptune: 5.410
These number are based on major-axis, and on an assumed circular orbit, so they will not agree with the official stated mean orbital velocity.
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