With over 133 million workers in the US having LinkedIn profiles, and millions of jobs posted on LinkedIn in the US every month, the professional networking site has access to a trove of data on workforce trends in America.

And LinkedIn has just announced that they're harnessing that data to produce a new monthly report, The LinkedIn Workforce Report, on employment trends in the US workforce.

The report offers insights into which industries are experiencing the fastest growth rates in hiring, which cities in the US have the biggest skills gaps, and migration trends across the country.

One of the analyses LinkedIn's report offers is a map showing the 10 cities that experienced the most migration in the past year. Seattle, Portland, Austin, Denver, and Charlotte gained the most workers over the last 12 months. For every 10,000 LinkedIn members in Seattle, 68.2 workers moved to the city in the last year --mostly from San Francisco, Chicago, New York City, and Los Angeles, according to the report.

"Seattle, Portland, Austin, Denver, and Charlotte are all cities that have a lower cost of living than cities like New York and San Francisco, and have access to the great outdoors," says LinkedIn.

West Palm Beach, Tampa/St. Petersburg, Nashville, Las Vegas, and San Francisco were another five cities that attracted the most workers over the past year.

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Before you start packing and heading to one of these top cities, however, be sure to take a close look at the sections of the LinkedIn report that show which cities have shortages -- and surpluses --of skills.

LinkedIn's analysis highlights the 10 cities with the biggest scarcity of skills: San Francisco, Austin, Washington, DC, Seattle, Boston, Los Angeles, New York City, Denver, Raleigh-Durham, and Charlotte. These are cities where the demand for workers exceeds supply, and should be on your short list if you're looking to relocate.

And the 10 cities with the biggest over-supply of skills? West Palm Beach, Miami/Ft. Lauderdale, Houston, Hartford, Cleveland/Akron, Greensboro/Winston-Salem, Sacramento, Philadelphia, Orange County, and Las Vegas. You'll want to take a closer look at the job opportunities available in your industry before making the decision to move to one of these cities.