You could get off your lazy ass and look it up yourself. <<Shoccckk and HORROR>>
People have posted it multiple times. USA has so much NG they stopped counting after 2015 time period. The Haynesville alone has 200 years of USA NG consumption(100Bcf/d) and had 100 years of NG consumption before counting the advances in shale fracking. Here is the 1990's Haynesville assessment: https://pubs.usgs.gov/fs/2017/3016/fs20173016.pdf With advances in recovery due to Fracking it is several times higher now. In case you can't do the simple google search, it is NOT tied to the Permian basins or other Texas fields which is providing near all of the NG currently forcing NG prices into the NEGATIVE over the last couple months in Texas.
Marcellus/Utica NG fields have at least 10X more than the Haynesville. USGS quit tabulating it nearly a decade ago. New York Banned exploration, new pipe networks etc so how far north it goes... Unknown, but Ohio, Pennsylvania, W. Virginia, Kentucky, and more than likely Tennessee as well.
NG is flooding out of Bakken ND with no end in sight and the stated "reserves" are conventional and low, but if you add Fracking, the reserves are at this point effectively infinite as no one knows due to the economic concerns for tabulating "reserves" are transport, though they are currently capturing ~90+++% of the NG now and actively creating giant NG storage fields due to ever increasing recovery ratio's. NG currently sends ~1Trillioncf/year only limited by pipeline capacity. How much is there? No one knows. Other than it is a by product of oil and no one is looking for NG. It extends fully under Montana into VERY rugged territory where not even roads for the most part exist and only a rare few wells have been drilled in the South Eastern portion of the state. NG was found, but no oil and the entire blocks were written off.
Once the Marcellus/Utica NG fields/ were realized, the gargantuan NG fields under pretty much the entire state of Michigan ceased operations(Edit: not quite true). How much is there? No one knows other than it exists and have been slowly using it for several decades.
In short, the ENTIRETY of the Eastern USA has NG under it is the short answer. Volcanic West... not so much though Utah is increasing NG exploration and hitting NG pretty much everywhere.
North Slope of Alaska, like North slope of Russia has vastly more. So much more it is inconceivable.
USA literally has THOUSANDS of years of NG even if ALL industry and transportation switched to NG and there was nothing other than NG.
There is a reason Ron wants NG vehicles etc. It is a rational product for EVERYTHING and EVERYONE.