Very Large Coordinates when Reading Shapefile using Python

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When using Python anad fiona package to read a shapefile of Boston, I am getting very large values in the tens of thousands. Why is this?

# Import Boston shapefileshapefilename = 'ZIPCODES_NT_POLY'shp = fiona.open(shapefilename + '.shp')coords = shp.boundsshp.close()Then running coords gives the output

(33869.92130000144, 777617.2998000011, 330800.31099999696, 959741.1853)

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