What are the Seneca, Kansas Zip Codes for 2020, 2019Primary Zip Codes for SenecaZip CodePrimary CitySecondary City66538SenecaSeneca, Kelly, St BenedictCities sharing Zip Codes with SenecaZip CodePrimary CitySecondary CityMore Information66538SenecaKelly66538SenecaSt BenedictRelevant Related Information