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The city name that the usps assigned as primary for this zip code. The city name that the usps assigned as primary for this zip code. Enter an address to find the zip+4: The zip+4 code is an extension of. Web zip code 20777 in highland, md. Look up a zip code. Web highland main city page zip codes in us 20777 zip code (highland, md) 20777 zip code (highland, md) detailed profile. Web look up a zip code ™. Web 20777 is the only zip code for highland, md. Web zip code 20777 has segments in 2 counties / independent cities (howard, montgomery). Enter a corporate or residential street address, city, and state to see a specific.