· The York County 17403 zip code is located in the Greater York region and encompasses portions of the City of York as well as southern and eastern York City suburbs. The zip code covers approximately 21 square miles. As of 2015, the total population in the 17403 zip code was 38,875. There were 14,612 households with an average household income of $67,327 (per capita income - $25,673). There were 1,695 businesses employing approximately 29,915 individuals.