Sarah Keitt lives in Fairfield, Connecticut. Keitt graduated from Hingham High School. She earned a bachelor's degree in biology from Middlebury College in 1991 and a Master's of Public Health (MPH) in maternal and child health from the George Washington University School of Medicine and Health Sciences in 1996. Her career experience includes working as an adjunct instructor for community health at George Washington University and as a scientific programs manager for the Society For Women’s Health Research. Keitt volunteered as an executive board member of the Metropolitan Washington Public Health Association and in various roles with the National Multiple Sclerosis Society, including serving on the National Programs Advisory Council, as vice chair of the government relations committee for the Virginia chapter, and as a district activist leader for the Connecticut chapter. She was elected to serve on the Fairfield Town Plan and Zoning Commission.