Natural Gas, Gaseous State

Gaseous natural gas — transported by pipeline rather than as LNG — enters the US almost entirely via cross-border pipeline infrastructure, making origin geography a defining commercial factor. The entire heading resolves to a single 10-digit tariff line (2711210000), so classification disputes are rare, but regulatory compliance with Department of Energy import authorization requirements is a key entry consideration. Canada and Mexico are by far the dominant suppliers, reflecting the continent's integrated pipeline grid. China also appears among recorded import sources, likely representing re-exports or specialty gas movements rather than pipeline volumes.