Here is short summary of useful data for the States in the Union, sorted by claimed size (unusable mana zones’ contribution to area size is usually disputed).

Marches of the Montana

(Pre-Fall: Alaska/southwest, British Columbia/west shore, Washington, Idaho/north, Montana, Oregon/north)

Census: 980,000 sq. miles, pop. 239,500

Capital: New Benton

Independence State

(Pre-Fall: Indiana, Ohio, Pennsylvania/south, Illinois/southwest, Kentucky, West Virginia, Virginia/west tip, Arkansas/northeast, Tennessee, South Carolina/west tip)

Census: 728,000 sq. miles (+377,000 of eastern mana zone), pop. 727,000

Capital: Vernon

Union Capital: Nashville

Marches of the South

(Pre-Fall: Utah/south, Colorado/west border, Arizona/northeast border, New Mexico/northwest border)

Census: 646,500 sq. miles, pop. 489,500

Capital: Dolores

Dakota Marches

(Pre-Fall: Manitoba/southern border, North Dakota, Minnesota/west, South Dakota/north)

Census: 507,000 sq. miles, pop. 230,000

Capital: South Branch

Lake Marches

(Pre-Fall: Minnesota/southeast, Wisconsin, Michigan, Illinois/northeast, Ontario/south tip)

Census: 490,000 sq. miles, pop. 187,000

Capital: Lake Mills

This story has been unlawfully obtained without the author's consent. Report any appearances on Amazon.

Marches of the Algonquin ⊗

(Pre-Fall: Quebec/south border, Ontario/southeast tip, New York, Vermont, New Hampshire, Maine, New Brunswick, Nova Scotia/disputed; Pennsylvania/north)

Census: 435,000 sq. miles, pop. 153,500

Capital: New Drum

Eagle Republic

(Pre-Fall: California/north, Nevada/west)

Census: 358,000 sq. miles, pop. 318,000

Capital: La Grange

Marches of the Star

(Pre-Fall: New Mexico/northeast border, Texas/northwest)

Census: 303,000 sq. miles, pop. 470,500

Capital: Seminole

Later State ⊗

(Pre-Fall: Kansas/east, Oklahoma/north, Missouri/southwest)

Census: 293,000 sq. miles, pop. 126,000

Capital: New Riley

Lone Star

(Pre-Fall: Texas/northeast, Oklahoma/south border)

Census: 270,000 sq. miles, pop. 159,000

Capital: Decatur

Cheyenne ⊗

(Pre-Fall: Wyoming/east, South Dakota/southwest, Nebraska/west)

Census: 242,000 sq. miles, pop. 357,500

Capital: Alcova

Winnebago State ⊗

(Pre-Fall: Nebraska/east, Iowa/west border)

Census: 240,500 sq. miles, pop. 310,000

Capital: Tekamah

Greater Idaho ⊗

(Pre-Fall: Idaho/south, Nevada/northeast, Utah/northwest)

Census: 184,500 sq. miles, pop. 283,500

Capital: New Boise

Fremont

(Pre-Fall: Colorado/east border, Kansas/west)

Census: 180,000 sq. miles, pop. 188,000

Capital: Fremont

True Colorado

(Pre-Fall: Colorado/north & east)

Census: 140,000 sq. miles, pop. 113,000

Capital: Bailey

True Missouri

(Pre-Fall: Iowa/southeast, Missouri/northeast)

Census: 137,000 sq. miles, pop. 90,000

Capital: Florida

Pacifica ⊗

(Pre-Fall: Oregon/south)

Census: 128,000 sq. miles, pop. 67,000

Capital: Bandon

Yellowstone ⊗

(Pre-Fall: Wyoming/west)

Census: 125,000 sq. miles, pop. 160,500

Capital: Colter Bay

Sunshine State ⊗

(Pre-Fall: Georgia/south, Florida/north)

Census: 121,000 sq. miles (+92,500 of mana zone at the tip), pop. 22,500

Capital: Madison

Bayou

(Pre-Fall: Louisiana/east, Mississippi/south border, Alabama/south border)

Census: 119,000 sq. miles, pop. 65,000

Capital: New Monterey

Atlanta

(Pre-Fall: Mississippi/northeast, Georgia/north)

Census: 105,000 sq. miles, pop. 52,500

Capital: New Atlanta

Lost State ⊗

(Pre-Fall: Arkansas/southeast, Mississippi/northwest, Alabama/north)

Census: 75,500 sq. miles (+151,000 sq. miles of uninhabitable mana zone), pop. 49,500

Capital: Tennessee

Missouri Protectorate

(Pre-Fall: Louisiana/north)

Census: 56,000 sq. miles, pop. 24,500

Capital: Farmerville

Crow State ⊗

(Pre-Fall: South Dakota/southeast, Iowa/north)

Census: 52,000 sq. miles, pop. 121,000

Capital: Custer

⊗ Denotes States that joined the Union of States after the initial signatories of the Treaty of The Union.

Changed populations in the Union:

Minotaurs (all central States; originally True Colorado): 8,500

Incubi (Sunshine State): 5,500

Thirsters (Marches of the Algonquin): 4,500

Dwarves (Fremont): 3,500-5,000 (estimate, no real census)

Dryads (Bayou): 3,000

Trolls (Sunshine State enclave; originally Caribbean islands): ~500

Mooneyed (Independence State): 200

Erlang (Eagle Republic enclave; originally Empire of Dàzhì): ~50

Neighboring Polities:

Northwest: Tribal Lands (alliance)

North: Hudson Bay Tribes

Northeast: New France

South: Aztlan & Sinaloa