221210  Natural Gas Distribution

This U.S. industry comprises: (1) establishments primarily engaged in
operating gas distribution systems (e.g., mains, meters); (2)
establishments known as gas marketers that buy gas from the well and
sell it to a distribution system; (3) establishments known as gas
brokers or agents that arrange the sale of gas over gas distribution
systems operated by others; and (4) establishments primarily engaged 
in transmitting and distributing gas to final consumers.

The data published with NAICS code 221210 are comprised of these 
parts of the following SIC industries:

    4923 (pt)  Natural gas transmission and distribution 
               (distribution)
    4924       Natural gas distribution
    4925       Mixed, manufactured, or liquefied petroleum gas 
               production and/or distribution
    4931 (pt)  Electric and other services combined (natural gas 
               distribution)
    4932       Gas and other services combined (natural gas 
               distribution)
    4939 (pt)  Combination utilities, nec (natural gas distribution)