He was the son of Nahshon, married "Rachab" of Matthew 1:5 (possibly Rahab, of Jericho), and Boaz (or Booz) was their son. Thus, according to the biblical genealogies, Salmon is the patrilineal great-great-grandfather of David. Salmon is mentioned in 1 Chronicles 2:10-11, Ruth 4:20,21, Matthew 1:4-5 and Luke 3:32. Nahshon was one of the Israelite leaders present with Moses  during the exodus from Egypt who undertook a "census of all the congregation of the children of Israel" and therefore Salmon would probably have been a contemporary of Joshua and part of the generation of Israelites who entered the promised land.
Rahab's marriage to Salmon is not mentioned in the account of her hiding Joshua's messengers sent out to spy out Jericho, although the narrative regarding her role concludes that "she dwells in Israel to this day".