From the Economic Policy Institute.  Conclusion :

State and local governments have many tools and strategies to spur economic growth. One tool proven particularly effective by research is public investment that increases the efficiency and attractiveness of local amenities such as transportation and the quality of local education. Public investment opportunities are obviously curtailed if state and local governments willingly forfeit revenue in the name of attracting businesses. Given this sharp trade-off with public goods provision, the benefits of tax incentives should be exceedingly strong to be pursued as good development policy. So far, the best research has not identified such strong benefits.
 
We find that opening an Amazon fulfillment center does lead to gains in warehouse jobs in a county, but does not lead to gains in overall county-level employment. These findings are consistent with theories arguing that luring establishments from existing national employers to a particular locale may just displace incumbent jobs. 
 
Amazon fulfillment warehouses in Pennsylvania
 
Pennsylvania Cumberland County Third quarter 2010
Pennsylvania Cumberland County Third quarter 2010
Pennsylvania Cumberland County Second quarter 2013
Pennsylvania Cumberland County First quarter 2015
Pennsylvania Lackawanna County Fourth quarter 2010
Pennsylvania Lehigh County Third quarter 2010
Pennsylvania Lehigh County Second quarter 2011
Pennsylvania Luzerne County Third quarter 2008
Pennsylvania Luzerne County Fourth quarter 2016
Pennsylvania Northampton County Fourth quarter 2016
Pennsylvania York County Third quarter 2010

 

http://www.epi.org/publication/unfulfilled-promises-amazon-warehouses-do-not-generate-broad-based-employment-growth/