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.
When doing research, it's often necessary to find income by Census tract data especially if you are tasked to identify low income Census tracts. A Census tract is a division of a county, much like a zip code. Tracts tend to have between 2,500 and 8,000 people.