I'd first try Craigslist. Put it in the Wanted Section. Offer someone like $50 to remove it and haul it away- its going to take them 1-2 hours depending.

Here's the how to if you want to do it yourself:
You will need a sledgehammer and a shovel to two..
first the will dig around it, removing the dirt until they can see the concrete. Then they will hit it the concrete with the sledge causing it to break. Two people will pull the pole out. They may have to affix something to the pole so they can pull vertically. They will either remove the concrete chunks and refill with dirt or just fill with the concrete pieces in the hole.

I've also see it done with a off road style truck jack like in this link:
http://www.postpullers.com/

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