In the present study, two cycles of Mass Selection (MS) and Selfed Progeny Selection (SPS) were conducted on two sweet corn populations (BC2-10 and BC1-10 x Syn-II). The improved populations generated from each of the two populations were evaluated in comparison with the base populations, at two locations, to determine the genetic gains, to estimate heritability and correlations among traits measured. The two base populations showed varied average realized responses to MS and SPS. In BC2-10 derived populations, the realized responses to MS were 5.1% in cycle 1 (C1) and 4.8% in cycle 2 (C2), whereas, the realized responses to SPS were 9.1% in C1 and 1.2% in C2. In BC1-10 x Syn-II derived populations, the realized responses to MS were 5.5% in C1 and 2.9% in C2, while the realized responses to SPS were 5.6% in C1 and 2.9% in C2. The two selection methods were equally effective in improving the populations for ear length, except in C1 of BC2-10, where SPS was more effective than MS. Both selection methods were also effective in increasing fresh ear yield and number of kernels per row. Response of other correlated traits depended on selection methods used and populations under selection. The improved populations generated could serve as better germplasm sources to develop vigorous inbred lines and open pollinated varieties and further selection in these populations could offer better responses.