The dynamic compaction properties of 1.3‐, 2.2‐, 3.3‐, 4.7‐, 5.8‐, and 7.0‐g/cc porous iron as determined from air gun plate impact experiments are described. The data indicate that the final pressure‐particle velocity states produced by impacting the three lower density materials are well approximated by a simple locking‐type model, neglecting elastic response of the material. In contrast, the higher density materials exhibit definite yield points and well‐defined states of partial compaction below about 26 kbar. These states are described in terms of the measured yield points and the properties of solid iron. At pressures above the 26 kbar necessary for complete compaction, agreement was observed between the data and the predictions using Hugoniot theory with the Gruneisen equation of state.