To understand the immediate impact of a university-school district partnership that places preservice teachers (both traditional undergraduates and graduate students in an initial licensure residency program) in a Professional Development School (PDS) model, this exploratory study reviewed data from yearly examinations required by the Kansas State Department of Education for the purpose of monitoring average yearly progress in reading and math. Scores of students (grades 3-5) in 16 PDS sites were compared to scores of students in 16 non-PDS sites in the same district, matched for similarity based on demographic criteria. Findings indicate statistically significant differences in gains in the percent of students performing at or above proficient on state reading assessments, with students attending PDS sites outperforming those who attend non-PDS sites. Findings related to math performance approached significance but did not reach statistically significant levels. These findings suggest that having pre-service teachers in a PDS site, utilizing a strong university-school partnership model, can positively impact student achievement.