  The solar activity is asymmetric in both hemispheres in almost all cycles.
This asymmetry is observed both in cycle amplitude and period. We have used
about 90~years of sunspot-area data from the Kodaikanal Solar Observatory to
study the North--South asymmetry in sunspot activity. The monthly mean
sunspot-area showed the northern hemisphere dominated in Solar Cycles 16, 19,
and 20, and the southern hemisphere dominated in Cycles 18, 22, and 23. The
13-months smoothed data indicated that in Cycle 17 and 21, the northern and
southern hemisphere showed equal amplitude. Cumulative sunspot area showed that
the northern hemisphere dominated in Cycles 18, 19, 20, and 21, with a large
difference between the two hemispheres in Cycles 19 and 20. The northern
hemisphere activity led by 12, 15, and 2 months in Cycles 20, 21, and 22,
respectively. No significant phase difference is found between the two
hemispheres in Cycles 16, 17, 18, 19, and 23. The wavelet technique is used to
find Rieger-type periodicities in the sunspot cycles. The cross-wavelet
analysis of these data sets showed several statistically significant common
periodicities like the Rieger-type periodicities and Quasi-biennial
oscillations. The Gnevyshev gap was found in both the hemispheric data in
Cycles 16, 18, 21, 22, and 23. These results are consistent with the earlier
reported characteristics of North--South asymmetry in sunspot-area data. These
results suggest that the Kodaikanal Observatory data complement the existing
sunspot data from other observatories to study solar activity over long and
short periods.
