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Look up a zip code. Basic data & usps preferred city name preferred name, usps phoenix, md. Web look up a zip code ™. Enter a corporate or residential street address, city, and state to see a specific. 21131 zip code is spread between the. Web phoenix is an unincorporated community located in baltimore county in the state of maryland, united states. Web jacksonville, md | phoenix, md zip code 21131: Web zip code 21131 is located in the city of phoenix, maryland and covers 21.033 square miles of land area. Web zip code 21131 is located in the county of baltimore in the state of maryland.