· The York County 17404 zip code is located in the Greater York region and encompasses portions of the City of York as well as West York and northern York City suburbs. The zip code covers approximately 23 square miles. As of 2015, the total population in the 17404 zip code was 35,808. There were 14,028 households with an average household income of $69,721 (per capita income - $27,614). There were 2,255 businesses employing approximately 15,021 individuals.