Largest metros of each region of the United States
I’m not using the traditional definition for metros. Instead, I’ve opted to expand metros out to media market size.
Northwest
Alaska, Washington, Oregon, Idaho, and Montana
1. Seattle, WA
2. Portland, OR
3. Spokane, WA
4. Boise, ID
5. Yakima, WA
6. Eugene, OR
7. Medford, OR
8. Anchorage, AK
9. Idaho Falls, ID
10. Missoula, MT

Mid-Pacific
California, Hawaii, American Samoa (U.S. Territory), Guam (U.S. Territory), and Northern Mariana Islands (U.S. Territory)
1. Los Angeles, CA
2. San Francisco, CA
3. Sacramento, CA
4. San Diego, CA
5. Fresno, CA
6. Honolulu, HI
7. Bakersfield, CA
8. Santa Barbra, CA
9. Monterey-Salinas, CA
10. Chico-Redding, CA
11. Palm Springs, CA
12. Eureka, CA

Rocky Mountains
Wyoming, Colorado, Utah, and Nevada
1. Denver, CO
2. Salt Lake City, UT
3. Las Vegas, NV
4. Colorado Springs, CO
5. Reno, NV
6. Grand Junction, CO
7. Cheyenne, WY
8. Casper, WY

Southwest
Arizona, New Mexico, Texas, and Oklahoma
1. Dallas-Fort Worth, TX
2. Houston, TX
3. Phoenix, AZ
4. San Antonio, TX
5. Austin, TX
6. Oklahoma City, OK
7. Albuquerque, NM
8. Tulsa, OK
9. Tucson, AZ
10. Brownsville-McAllen, TX
11. El Paso, TX
12. Waco, TX

Great Plains
North Dakota, South Dakota, Nebraska, Kansas, Iowa, and Missouri
1. Saint Louis, MO
2. Kansas City, MO
3. Omaha, NE
4. Springfield, MO
5. Des Moines, IA
6. Wichita, KS
7. Cedar Rapids, IA
8. Davenport, IA (Quad Cities)
9. Lincoln, NE
10. Sioux Falls, SD
11. Fargo, ND
12. Topeka, KS

Great Lakes
Michigan, Wisconsin, Minnesota, Illinois, Indiana, and Ohio
1. Chicago, IL
2. Detroit, MI
3. Minneapolis-Saint Paul, MN
4. Cleveland, OH
5. Indianapolis, IN
6. Columbus, OH
7. Cincinnati, OH
8. Milwaukee, WI
9. Grand Rapids, MI
10. Dayton, OH
11. Flint, MI
12. Green Bay, WI

Northeast
Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, Connecticut, and New York
1. New York City, NY
2. Boston, MA
3. Hartford, CT
4. Buffalo, NY
5. Providence, RI
6. Albany, NY
7. Rochester, NY
8. Syracuse, NY
9. Portland, ME
10. Burlington, VT

Mid-Atlantic
Pennsylvania, New Jersey, Delaware, Maryland, Washington, DC, Virginia, and West Virginia
1. Philadelphia, PA
3. Pittsburg, PA
4. Baltimore, MD
5. Harrisburg, PA
6. Hampton Roads, VA (Norfolk-Virginia Beach)
7. Richmond, VA
8. Scranton, PA
9. Roanoke, VA
10. Charleston-Huntington, WV

South Central
Kentucky, Tennessee, Arkansas, Louisiana, Mississippi, and Alabama
1. Nashville, TN
2. Birmingham, AL
3. Louisville, KY
4. New Orleans, LA
5. Memphis, TN
6. Little Rock, AR
7. Mobile, AL
8. Knoxville, TN
9. Lexington, KY
10. Huntsville, AL
Southeast
North Carolina, South Carolina, Georgia, Florida, Puerto Rico (U.S. Territory), and U.S. Virgin Islands (U.S. Territory)
1. Atlanta, GA
2. Tampa-Saint Petersburg, FL
3. Miami, FL
4. Orlando, FL
5. Charlotte, NC
6. Raleigh-Durham, NC
7. West Palm Beach, FL
8. Greenville, SC
9. Jacksonville-Saint Augustine, FL
10. Greensboro–Winston-Salem, NC