The vapor pressures of three 2-dialkyl aminoethanethiol compounds, 2-dimethyl aminoethanethiol (DMA), 2-diethyl aminoethanethiol (DEA), and 2-diisopropyl aminoethanethiol (DIA), have been determined using complementary methods that enable data collection in the ambient and high temperature ranges using vapor saturation and differential scanning calorimetry, respectively. Previously published vapor pressure data for these materials are sparse, conflicting, and limited in the pressure ranges covered. This work greatly expands the experimental range and, owing to the good agreement obtained using complementary methods, significantly enhances confidence in the accuracy of the measured data. In addition to the observed data, this report includes derived properties, that is, temperature-dependent volatility and heats of vaporization.