Previous studies have reported that seed yield in soybean can be improved using favorable alleles from PIs. Therefore the objective of this study was to identify unique alleles in four populations (A3, B3, E and Z) with exotic PIs as donors and IA3023, U98-311442, Elgin and Zane as adapted parents. The A3 and B3 populations consist of F₆ lines and the E and Z populations consist of BC₂F₄ and BC₂F₆ lines. During 2005 and 2006, the four populations were tested for maturity, height, lodging and seed yield. In the A3 population, five yield QTL were detected. The exotic parent allele for QTL on LG J and O increased yield by 1.8 and 2.4 bu a^-1. The LG O QTL was associated with height, but the LG J QTL was not associated with measured agronomic traits. In the B3 population, five yield QTL were detected. Several progeny lines significantly exceeded the yield of the domestic parent by up to 4.2 bu a^-1, and performed statistically equal to the check LD00-3309. QTL on LG A1 and C1 were derived from the exotic parent, increased yield by 1.9 and 1.3 bu a^-1, and were not associated with other agronomic traits. The LG C1 QTL mapped at least 60cM from previously reported QTL, with no detected effect on agronomic traits. Two yield QTL were detected over environments in population E on LG C2 and C1, and the exotic parent allele increased yield by 1.2 and 1.7 bu a^-1. Though no yield QTL have been previously mapped to the LG C1 region, we found a positive association with maturity and lodging in our study. One yield QTL was consistently found on LG F in the Z population with the exotic parent allele increasing yield by 3.7 bu a^-1.