Last updated 2017, appears to have dates!
http://data.houstontx.gov/dataset/city-tax-increment-reinvestment-zones-tirz
==Dallas, TX==
Has a map: http://www.arcgis.com/home/webmap/viewer.html?url=https://gis.dallascityhall.com/wwwgis/rest/services/Eco_public/EconomicDevelopment/MapServer/1
But the data doesn't contain dates and doesn't appear to be exportable.
It looks like there is Dallas data with dates from 2016: http://www.dallascad.org/GISDataProducts.aspx
==St. Louis==
St. Louis has data but without GIS shapes. The data is here: http://www.bettertogetherstl.com/studies/economic-development/tif-database . It was apparently extracted from a 2015 report here: http://dor.mo.gov/pdf/2015TIFAnnualReport.pdf . The locations are google mapped here: http://www.bettertogetherstl.com/tax-incremental-financing-map
==Cities We Couldn't Find==
*Herndon, VA
*Providence, RI
There's data on a couple of places that we don't care about on https://ckan.geoplatform.gov/#?q=tax%20increment
==Other Stuff==
City of Philly Enterprise Zones:
Enterprise Zones - Data includes commercial and industrial zones, i.e. areas with specific federal enterprise zone designation meant to attract and support businesses in blighted areas. Blighted areas are defined as meeting one of seven city mandated criteria, including unsafe, unsanitary and inadequate conditions; economically or socially undesirable land use; and faulty street and lot layout. https://www.opendataphilly.org/dataset/enterprise-zones
Also Empowerment Zones. https://www.opendataphilly.org/dataset/empowerment-zones
Larimer County Colorado: https://www.larimer.org/assessor/tif (no data)
New Hampshire report (2003) says that "some have GIS data" http://www.swrpc.org/files/data/com_econ_dev/ed/December%202003_%20TIF%20Handbook_7232010forweb.pdf
We have Nashua, NH (max 14 active) in our data, but it isn't one that has GIS data.
Sherman, TX has GIS data without dates: https://koordinates.com/layer/16403-finance-tax-increment-finance-tif/
Cincinnati has TIFs (http://choosecincy.com/Economic-Development/Programs-Services/Incentives-Financing/Tax-Increment-Financing.aspx) but no GIS data...
Michigan as some state level data (not GIS) in summary somewhere because it is reference in this report: http://www.senate.michigan.gov/SFA/Publications/Notes/2016Notes/NotesWin16dk.pdf
==Academic/Policy papers==
A policy paper on the econ effects of TIFs https://projects.cberdata.org/reports/TifEconEffects-012815.pdf