Not sure if the table below will work. But I really wondered how many cops there were if you added up all the local forces nearby. The issue is just what potential support there is the G20 event. The answer I get is that as of 2007 there were 2,505 total full time officers in Allegheny County local governments, and another 498 part-time police officers. That includes the City of Pittsburgh's force of around 850 full time officers. I suspect those numbers would have come down a bit in the last 2 years, but that's it for a ballpart number. So even the maximum potential pool of supplemental law enforcement to back up the city police force from elsewhere in the county does not really come close. Even if every single law police officer in the county supported G20, which would leave nobody minding the store back home anywhere, you don't get near the 4,000 goal. Nearby counties have other forces as well, but I doubt the numbers are going to really change the answer too much.
But if as it seems, even the larger and better off forces don't have much to contribute, the smaller ones are even less able to provide from their minimal ranks. Below is the list of the largest police forces in the county, ranked by total officers counting full time and part time equally. It's pretty remarkable in how few forces have more than a handful of officers. The full list I have put online here
|Government||Full Time||Part Time||Total|
|Source: 2007 Census of Governments|