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Pipeline Name	Market Regions Served	Primary Supply Regions	States in Which Pipeline Operates	Transported (billion cubic feet)	System Capacity (MMcf/d) ¹	System Mileage
Thirty Largest U.S. Interstate Natural Gas Pipeline Systems, 2006 (Ranked by system capacity, million cubic feet per day (MMcf/d))
Columbia Gas Transmission Co.	Northeast	Southwest, Appalachia	DE, PA, MD, KY, NC, NJ, NY, OH, VA, WV	1,792	9,000	10,318
Transcontinental Gas Pipeline Co.	Northeast, Southeast	Southwest	AL, GA, LA, MD, MS, NC, NY, SC, TX, VA, GM	2,751	8,161	10,412
Northern Natural Gas Co.	Central, Midwest	Southwest	IA, IL, KS, NE, NM, OK, SD, TX, WI, GM	950	7,200	15,743
ANR Pipeline Co.	Midwest	Southwest	AR, IA, IL, IN, KS, KY, LA, MI, MO, MS, NE, OH, OK, WI, GM	2,058	7,129	10,600
Texas Eastern Transmission Corp.	Northeast	Southwest	AL, AR, IL, IN, KS, KY, LA, MI, MO, MS, NJ, NY, OH, OK, PA, TX, WV, GM	1,241	6,672	9,176
Tennessee Gas Pipeline Co.	Northeast, Midwest	Southwest, Canada	AR, KY, LA, MA, NY, OH, PA, TN, TX, WV, GM	1,678	6,329	14,100
El Paso Natural Gas Co.	Western, Southwest	Southwest	AZ, CO, NM, TX	1,653	6,152	10,295
Dominion Transmission Co.	Northeast	Southwest, Appalachia	PA, MD, NY, OH, VA, WV	585	5,934	3,392
Natural Gas Pipeline Co. of America	Midwest	Southwest	AR, IA, IL, KS, LA, MO, NE, OK, TX, GM	1,709	4,508	9,297
Northwest Pipeline Corp.	Western	Canada, Central	CO, ID, OR, UT, WA, WY	676	4,500	3,865
Southern Natural Gas Co.	Southeast	Southwest	AL, GA, LA, MS, SC, TN, TX, GM	805	3,532	7,439
Centerpoint Gas Transmission Co.	Southwest	Southwest	AR, KS, LA, OK, TX	671	3,432	6,170
Colorado Interstate Gas Co.	Central	Central, Southwest	CO, KS, OK, TX, WY	733	3,170	3,979
Texas Gas Transmission Corp.	Midwest	Southwest	AR, IN, KY, LA, MS, OH, TN	725	3,098	5,609
Great Lakes Gas Transmission Co.	Midwest	Canada	MI, MN, WI	819	2,958	2,115
Gulf South Pipeline Co.	Southeast, Southwest	Southwest	AL, FL, LA, MS, TX, GM	510	2,946	6,532
Panhandle Eastern Pipeline Co.	Midwest	Southwest	IL, IN, KS, MI, MO, OH, OK, TX	579	2,840	6,376
Gas Transmission Northwest Corp.	Western	Canada	ID, OR, WA	805	2,636	1,356
Northern Border Pipeline Co.	Midwest, Central	Canada	IA, IL, IN, MN, MT, ND, SD	858	2,626	1,400
Southern Star Central Pipeline Co.	Central	Central	CO, KS, MO, NE, OK, TX, WY	317	2,526	5,725
Wyoming Interstate Gas Co.	Central	Central	CO, WY	699	2,330	725
National Fuel Gas Supply Co.	Northeast	Canada, Appalachia	NY, PA	309	2,312	1,502
Florida Gas Transmission Co.	Southeast	Southwest	AL, FL, LA, MS, TX, GM	737	2,206	4,869
Questar Pipeline Co.	Central	Central	CO, UT, WY	384	2,192	1,722
Algonquin Gas Transmission Co.	Northeast	Southwest	CT, MA, NJ, NY, RI	330	2,184	1,103
Columbia Gulf Transmission Co.	Southeast, Northeast	Southwest	KY, LA, MS, TN, GM	1,042	2,156	4,124
Alliance Pipeline Co. (US)	Midwest	Canada	ND, MN, IA, IL	646	2,053	888
Transwestern Gas Co.	Western	Southwest, Central	AZ, CO, NM, TX	629	2,048	2,362
Kern River Gas Transmission Co.	Western	Central	CA, NV, UT, WY	786	1,833	1,680
High Island Offshore System	Southwest	Gulf of Mexico	LA, GM	185	1,800	204
Sub-total				27,645	116,463	163,078
Other Interstate Systems (74)	- -	- -	- -	8,433	39,000	49,389
Total				36,078	155,463	212,467
¹ Capacity levels are reported to FERC in Btu, dekatherms, or volumetric units. For this presentation, reported capacity figures are presented as volumetric (MMcf/d = million cubic feet per day) assuming a conversion factor of 1 MMcf/d = 1 MDth/d (thousand dekatherms per day) = 1 Bbtu/d (billion btus per day).
Note: GM = Gulf of Mexico.
Source: Federal Energy Regulatory Commission (FERC), Mileage & Transport: FERC Form 2 & 2A "Major and Non-major Natural Gas Pipeline Annual Report," Capacity: FERC Annual Peak Day Capacity Report Section 284.13(d). Transportation volumes (Line 5 of Gas Accounts in FERC Form 2) may not represent all throughput on a pipeline during the year.