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.
Finding Census tract numbers can be difficult and time consuming. Many times, researchers will refer to a Census tract as Census Tract 7 or Census Tract 9.01. But Census Tract 7 or 9.01 doesn't uniquely identify the Census tract; in fact, there are hundreds of Census Tract 7s in the United States. A Census tract is uniquely identified by using its complete 11 digit Census tract number.