Previous commentaries on troop and contractor numbers:
Making the War in Iraq Palatable at Home - Part 2
Making the War in Iraq Palatable at Home

Newsweek has a short article that touches on troop surge numbers and the money that's been spent.  Minor quibble on some of their numbers...

Deployments: The Real Numbers
by Rod Nordland, Newsweek, March 22, 2007

There will soon be more American soldiers in Iraq than at any point in the war so far. The incoming surge of 21,500 troops is only part of that picture; in addition, the U.S. commander, Gen. David Petraeus, has asked for an additional Army aviation brigade, as well as a couple thousand military police. Other support troops will be coming in to Iraq as well, and they weren't all included in the original 21,500 estimate announced by President Bush last month. When all this is complete, sometime in July, the grand total of U.S. troops in Iraq will be 173,000, U.S. military officials here confirmed on background, apparently because of the sensitivity of these details. And it's likely that U.S. troop numbers will stay at that level for months more, perhaps even into 2008.

That's only part of the picture, however; the total number of U.S. troops deployed into the war theater, that is, Iraq and neighboring countries, may be as much as 100,000 more than that. Last August, for instance, the Congressional Research Service, quoting the Department of Defense's Contingency Tracking System, put the total deployment at 260,000, while the number actually in Iraq was at 140,000 to 160,000. (Other estimates by government-oversight bodies have put the total deployed in the theater at 202,000 to 207,000.)

Some things are getting smaller. The projected size of the Coalition of the willing has reached a historic low, but by July the number of soldiers from U.S. allies in Iraq will actually climb a tad, to 13,000, thanks to a commitment from the former Soviet republic of Georgia for a new brigade of 2,300 troops.

More...

Let's break down what Newsweek is reporting:

July 2007 - estimate

21,500 surge
4,600 additional surge
146,900 US troops
173,000 sub total
13,000 coalition troops

186,000 total

The State Dept has Coalition troop numbers currently at 13,205 - a pretty close match.

Brookings Iraq Index estimates 28,829 troops requested for the surge based on testimony from Deputy Secretary of Defense Gordon England. Again, not too far off.

Brookings  Iraq Index page 4

Deputy Secretary of Defense Gordon England testified March 1, 2007, that up to 7,000 additional troops could be necessary to help support the 21,500 additional combat troops President Bush announced would be sent to the region in January 2007. Of this figure, Deputy Secretary England testified that 2,400 of these had been approved.

Brookings Iraq Index also estimates 141,000 troops are currently in Iraq. Unfortunately Newsweek didn't give us current figures in their article.

Brookings  Iraq Index page 4

According to Lt. Col. Carl Ey, as of March 1, 2007, there were a total of 10,000 U.S. troops deployed in all of Iraq as a result of the troop increase announced by President Bush in January 2007. Figures from previous months suggest that this represents a net increase of troops, with the total number in theater going from approximately 130,000 in mid-February to 141,000 in early March 2007.

Using Brookings Iraq Index & State Dept figures

July 2007 - estimate

28,829 surge
141,000 US troops
169,829 sub total
13,205 coalition troops

183,034 total

The total is fairly close to what Newsweek is reporting. But it's that additional 100,000 troops in the "region" Newsweek brings up that really has me worried.

So, let's add in the additional 100,000 troops in the region and the 100,000 contractors of whom 25,000 are estimated to be security personnel.

183,000 troops
100,000 additional troops in the region
100,000 contractors

383,000 total

How would Americans react if they knew that we had 383,000 personnel in the region?