Religious leaders are influential and can impact the uptake of family planning (FP). In this study of the Healthy Timing and Spacing of Pregnancies (HTSP) project, led in Siaya County, Kenya, from September 2017 to June 2019, we present findings from the project's evaluation, to determine changes in knowledge of the key HTSP messages; changes in the proportion of community members who correctly identify at least three methods of contraception; changes in knowledge of healthy child spacing; and changes in modern contraceptive prevalence rate. This is a two-staged (baseline and endline) cross-sectional study, designed to assess the knowledge, practice, and coverage of HTSP/FP services. Primary data was collected using a questionnaire adapted from the United States Agency for International Development. Focus group discussion participants included men, women, representatives of community groups, faith leaders, and community heath volunteers. Frequencies were calculated from the ODK platform. Bivariate analytics (paired t test) were performed. At baseline, women respondents aged 20-29 years constituted 66.3% of the women participants, dropping to 60.9% at endline. Women aged 30-34 years constituted 11.9% and 22% of the entire women respondents, at baseline and endline, respectively. Men aged 20-29 constituted 45.2% of all men respondents at baseline, and 35.4% at endline. There were statistically significant increases in the knowledge of modern contraceptives among women (p = 0.0342), faith leaders (p = 0.0464), and the entire population (p = 0.0097), from baseline to endline. The HTSP model identifies success factors for FP interventions in Kenya and other low- and middle-income countries where faith leaders and community stakeholders are influential, and that women and faith leaders are much more easily impacted positively with these efforts, as measured by increased knowledge and awareness of modern contraceptive methods, compared with men.