In this work, we present densities at high pressures of three branched hydrocarbons: 3-methylpentane, 2,4-dimethylpentane, and 2,3,4-trimethylpentane from 283.15 to 363.15 K and at pressures up to 65 MPa. We have used a vibrating tube densimeter along with the forced path calibration method. This method considers mechanical properties of the cell and allows us to reach standard uncertainties less than 0.0004 g.cm(3). For 3-methylpentane, the new density data agree within 0.2% with densities from the literature. For the case of 2,4-dimethylpentane and 2,3,4-trimethylpentane, densities at high pressures have not been reported in the literature. Isobaric expansibility and isothermal compressibility are calculated using an equation of state correlated to the experimental density data.