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Fast-growing Seattle startups Zulily and Redfin have been named to Alley Insider’s Digital 100 ranking of the most valuable startups in the world.

Zulily debuted on the list at #28, with the daily deal site boasting an estimated value of $700 million. (GeekWire reported last month that Zulily’s latest $43 million financing round came with a valuation of about $750 million).

Meanwhile, Redfin also debuted on the list with an estimated valuation of $230 million.

Of course, coming up with valuations of privately-held companies can be more art than science. So, you’ve got to take some of the numbers with a grain of salt.

That said, the list does provide an interesting look at the startup ecosystem. Of course, the list is led by Facebook, which boasts a whopping value of $80 billion.

Last year, just one Seattle company made the list: Zillow.

The online real estate company obviously is no longer private, having completed an IPO earlier this summer. Zillow is now valued at $761 million — which would put it in the range of Trulia and Zulily on the Alley Insider list.

Interestingly, of the companies in the top 15, four have development offices in the Seattle area. So, at least in that regard, Seattle isn’t doing too shabby.

But, of course, we’d still like to see more than two companies make this list next year.

One possible oversight by Alley Insider when it comes to privately-held companies in the Seattle area is social networking upstart Lockerz, which just raised $36 million from Kleiner Perkins Caufield & Byers, former Microsoft CFO Greg Maffei and others.

I’ve not heard where the valuation came in for Lockerz, but I’d be surprised if it was lower than the $75 million valuation on SB Nation which ranks #100 on the Alley Insider list.

Here’s the full list.

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