Turbulent, axisymmetric, ethylene-air diffusion flames were studied at pressures from 0.1 to 0.8 MPa for flame-tip Reynolds numbers from 5300 to 21 000. Local and integrated soot volume fractions were determined from measurements of laser attenuation by the soot. Integrals of the soot volume fraction over the flame cross section increase with axial position in the early, soot-formation region of the flames, peaking at approximately one half of the visible flame length for all pressures. Radial soot-volume-fraction profiles are Gaussian, the width of the profiles increasing roughly linearly with axial position. For flames with the same flame-tip Reynolds number and residence time, the soot yield at the axial location of the peak soot volume fraction increases as p^1.4 for pressure p between 0.1 MPa and 0.5 MPa. At pressures greater than about 0.3 MPa, flames with long characteristic residence times have lower peak integrated soot volume fractions than comparable flames with relatively shorter residence times.