A capacitive position sensor is provided having a touch-sensitive area defined by a single-layer of electrodes arranged in a pattern along two axes. The electrode pattern includes a plurality of units each occupying a portion of the touch sensitive area along one axis. Each unit has at least three lines of elongate electrodes spaced apart in the one axis and extending for a length parallel to the other axis. The three lines of elongate electrodes in each unit comprise at least one line of drive electrodes and two lines of sense electrodes or at least one line of sense electrodes and two lines of drive electrodes. Selected electrodes of each unit are arranged in interconnected groups, each group having electrodes from more than one line which have partially overlapping extents along their length.