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Aims - We report new Very Large Array polarimetric observations of CompactSteep-Spectrum (CSS) sources at 8.4, 15, and 23GHz. Methods - Usingmulti-frequency VLA observations we have derived sub-arcsecond resolutionimages of the total intensity, polarisation, and rotation measure (RM)distributions. Results heading - We present multi-frequency VLA polarisationobservations of CSS sources. About half of the sources are point-like even atthe resolution of about 0.1x0.1 arcseconds. The remaining sources have doubleor triple structure. Low values for the percentage of polarised emission in CSSsources is confirmed. On the average, quasars are more polarised than galaxies.A wide range of RM values have been measured. There are clear indications ofvery large RMs up to 5\,585 rad m**(-2). CSS galaxies are characterized by RMvalues that are larger than CSS quasars. The majority of the objects show verylarge values of RM. Conclusions - The available data on sub-arcsecond-scalerest-frame RM estimates for CSS sources show that these have a wide range ofvalues extending up to about 36,000 rad m**(-2). RM estimates indicate anoverall density of the magneto-ionic medium larger than classical radiosources.

Radio polarimetry of compact steep spectrum sources at sub-arcsecond resolution