Mild TBI did not produce a significant change in the proportion of monocytes within the injured brain. Mild TBI did result in a 1.4 fold increase in monocyte-derived (MD-Mϕ) macrophages (*=p<0.002). There was also a modest, albeit statistically significant, increase in inflammatory tissue macrophages and inflammatory (iDC) dendritic cells (#=p<0.04). Severe TBI resulted in a 2.2 fold increase in infiltrating monocytes, an 11.3 fold increase in MD-Mϕ, a 3.9 fold increase in iMϕ, and a 4.5 fold increase in iDC as compared to sham (◆=p<0.001).