The largest deposits in United States are the Haynesville Shale and the Marcellus Shale. The former is located in Louisiana and Texas at depths of 3000 to 4000 m (10,000-13,000 ft) and is estimated to have 7100 cubic kilometers (250 trillion cubic feet) of natural gas. The latter stretches from New York through Pennsylvania to Ohio and West Virginia and a little bit into Western parts of Virginia and Maryland. A 2009 estimate by the Department of Energy put its reserves at 262 trillion cubic feet, although other calculations put it as high as 500 TCF, 10% of which is recoverable.
The Wikipedia list omits the San Juan Gas field in NW New Mexico, which is the largest producing field in the US. The Hugoton field in TX-OK-KS had more natural gas, but the San Juan field is the current largest producer. For the Haynesville and Marcellus production, it is by no means clear that anywhere close to the figures in the other answer, for natural gas in place, will actually be recoverable.
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