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I just ran some numbers for the heck of it. Google tells me that Pennsylvania Avenue from the Square to the Capitol is about a half a mile (2640 feet). From personal experience, it is about 75 feet wide, not counting the sidewalks.

That gives us 198,000 square feet.

If you allow 30”x30” for each person, that is 6.25 square feet.

That gives us 198,000/6.25=31,680 people.

It took about 20 minutes to walk it, and it was packed from 10:00 until about 1:00. That’s three hours/20 minutes = 9 repetitions.

31,680 x 9 = 285,120 protesters.

You can play with the figures some, but it gives a good idea of the max number of people there.

Nice methodology. But Google maps directions gives exactly one mile from the center of Freedom Plaza to the Peace Monument at the end of Pennsylvania Ave NW.

So using your numbers with that one change, then we’re talking about 570,240 people if the route was continuously full from 10 AM to 1 PM.

That is pretty consistent with what I observed, comparing the numbers between 9-12 and a largish March for Life.

Thank you. Your calculations are about right.(I am no pathagerin). National Parks says Penn. Ave. is 90 feet wide curb to curb..

The distance is twice your calculations and a little more. You gave an estimate of 198,000 people. That number however cannot remain static as the number of people moving through the camera continue for another hour.

So using your numbers 198,000 and doubling the distance would give us 400,000 people!

Beginning at the Willard Hotel

Walking directions to E Capitol Circle

1.3 mi – about 25 mins

Suggested routes

1401 Pennsylvania Ave NW

Washington, DC 20004

1.	Head southeast on Pennsylvania Ave NW toward 14th St NW	220 ft
2.	Turn right at 14th St NW	253 ft
3.	Turn left at Pennsylvania Ave NW	1.1 mi
4.	At the traffic circle, take the 1st exit onto E Capitol Circle Destination will be on the left	413 ft

E Capitol Circle

The camera is overlooking the Willard Hotel.

Here is a link to the video:

http://www.youtube.com/watch?v=LoPud1TeubM

I knew the distance was around a mile because if I have walked it once I have walked it 50+ times.

That is 300,000 people, minimum, at the apogee. There is no other way to count it.

BTW, the people who come through this camera shot, do not represent the sum total of all attendees, only the ones who took this route.

I will work on this more as I have some work to do.