The cartographic boundary files are named cb_yyyy_ss_<entity>_rr.zip where:

• yyyy = 4 digit year
  
• ss = state FIPS code or 'us' for a national level file
• entity = the entity name
• rr = resolution level
  • 500k = 1:500,000
  • 5m = 1:5,000,000
  • 20m = 1:20,000,000

For a list of entity names and their descriptions for the cartographic boundary files, please see the Entity Name Description files below:

The 2010 cartographic boundary files are named gz_2010_ss_lll_vv_rr.zip where:

• ss = state FIPS code or 'us' for a national level file
• lll = summary level code
• vv = 2-digit version code
• rr = resolution level
  • 500k = 1:500,000
  • 5m = 1:5,000,000
  • 20m = 1:20,000,000

For a complete list of summary level codes for the cartographic boundary files, please see our Summary Level Codes Page.