When you cross the sky bridge that stretches over the intersection between Huntington Avenue and Ring Road on your way into the Prudential Center, you’re crossing into one of the city’s most valuable zip codes.

The Pru itself could fetch $303 million on the open market, according to the city's most recent assessment, but the tiny area — just a single block bounded by Huntington Avenue on the south and Boylston Street on the north — contains a total of 37 properties that have been assessed to fetch a total of about $425 million. Excluding the Pru, the average address in the 02199 zip code is worth $3.5 million.

For anyone familiar with Boston’s real estate market, you shouldn’t be surprised by those extravagant numbers — just look at the glitzy businesses that make their homes in those gleaming towers — but how do they compare to the price of the average property in other neighborhoods?

In Charlestown, the price of just one of those comparatively inexpensive addresses could buy you almost six properties. The tower itself? That would fetch you about 500 properties — more, if you limit yourself to regular residential and commercial space.

On the other side of the city, in Jamaica Plain and West Roxbury, one of those 02199 addresses would fetch you eight and nine properties, respectively.

Even in the nearby glitz of Beacon Hill, you could trade one Pru address for two with 02108 zip codes.

In total, the city contains 38 zip codes. On an average price-per-property basis, 02199 tops them all. Does that make you feel better about what you paid for your patch of land?

How does your neighborhood stack up?

Data taken from the City of Boston's financial year 2012 assessment.