(See also wiki article Pithom
PITHOM - One of the two 'store-cities' said to have been built for the Pharaoh of the oppression by the Hebrews (Ex.1.11). The name occurs in the Papyrus Anastasi vi. in the reign of Seti II. (c 1205 BC). The site has been identified by Gardiner with Tell er-Retabeh. A town called Pithom (Pi-Tum, i.e. 'the house of the god Tum'), existed in Ramesside times in the Wadi Tumilat, a district which corresponds to the Biblical description of the land of Goshen. Naville's identification of Pithom with Tell el-Maskhuteh is no longer accepted.
[Article: Dictionary of the Bible, J.Hastings, 2nd Ed., T&T.Clark, 1963 - S.H.He.]
See also Wikipedia article - PITHOM.