Where is Zip Code 51351 map for 2020, 2019Primary Zip Codes for 51351Zip CodePrimary CitySecondary City51351MilfordMilford, West Okoboji, Old Town, W OkobojiCities sharing Zip Codes with 51351Zip CodePrimary CitySecondary CityMore Information51351MilfordOld Town51351MilfordW Okoboji51351MilfordWest Okoboji West Okoboji population stats Advertisements