Find minute by minute reports of yesterday's AFL-CIO / Occupy Portland march here. The report does not give an estimate of how many marchers there were. One reporter hesitantly guesses 2500, and I have also heard 4000.
link to www.oregonlive.com
I thought this was interesting and amusing:
'6:03 p.m. From The Oregonian's Alison Barnwell: Officer Rod Gustafson with the Portland Police traffic division waits for the ensuing marchers, Starbucks coffee in hand. He said the march is peaceful -- "just another day at the office," he said. "A routine march. This is pretty typical in Portland." '