The Observation Deck

I have a weed growing in my garden. I hope that it is just Giant Ragweed, but I am worried that it could also be the dangerous Hogweed - in which case, does the city remove it? Or, maybe I'm completely wrong and it's something else. It's already over 6 feet tall.

Is there someone in the city I can call to ID it? Or is anyone familiar with these weeds? Thanks.

http://www.invasivespeciesinfo.gov/plants/hogweed.shtml
Looks like you would be the first in Ohio but it is around us. So what does it look like and how did it grow to 6 feet tall?