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.
Census block numbers were assigned, where possible, by census tract, but for those cities that had not yet delineated census tracts, ââblock areasââ (called ââblock numbering areasââ [BNAs] in later censuses) were created to assign census block numbers.