Then usable tread depth is compared to remaining tread depth in order to calculate tread wear percentages. For example, a tire that started with 10/32 of original tread depth and has worn off 4/32 (down to 6/32 of remaining tread depth) is 50% worn.
1 If you know the census tract number: Use the IRS list of 2014 Qualified Census Tracts by county. 2  If you have a street address: Visit HUD's interactive QCT Map and enter the property address to view what Census Tract the property is located.
1 Tract lookup tools: 2  If you know your tract number, look up census info here. 3  If you know only the street address, you can look up tract code number here by street address.  If you only know the geographic area, you can look up the number based on geography here.