Most are volcanic in origin; some are due to meteoritic impacts. As in the case of Mercury, all the craters are due to meteoritic impacts. Because meteorites cannot survive passing through the atmosphere of Venus, all craters must be volcanic. Venus has very few craters and their origin is not known. Which one?
http://www.lpi.usra.edu/resources/vc/vchome.html This site is awesome it has all of the craters in any order you are looking for. Tells you whether they are volcanic or meteor related. and they have research files you can download.
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