Colorado (CO)

Other Series 02

Louisiana Purchase

Other Series 03

Treaty of Guadalupe Hidalgo

Cession 426

Adams, Arapahoe, Bent, Boulder, Chaffee, Cheyenne, Custer, Denver, Douglas, Elbert, El Paso, Fremont, Huerfano, Jackson, Jefferson, Kiowa, Kit Carson, Lake, Larimer, Las Animas, Lincoln

Cession 432

Moffat, Lincoln, White Pine, Carbon, Daggett, Duchesne, Emery, Garfield, Iron, Juab, Kane, Millard, Piute, Sanpete, Sevier, Uintah, Utah, Wasatch, Washington, Wayne

Cession 477

Bent, Cheyenne, Crowley, Elbert, El Paso, Kiowa, Lincoln, Otero, Prowers, Pueblo

Cession 478

Baca, Bent, Costilla, Las Animas, Otero, Prowers, Clark, Ford, Grant, Gray, Hamilton, Haskell, Kearny, Meade, Morton, Seward, Stanton, Stevens, Archer, Atascosa, Bandera, Baylor, Bexar

Cession 515

Alamosa, Conejos, Costilla, Eagle, Grand, Gunnison, Mineral, Moffat, Pitkin, Rio Grande, Routt, Saguache, Summit, Grand, San Juan, Uintah

Cession 520

Jackson, Moffat, Routt, Bannock, Bear Lake, Bingham, Blaine, Bonneville, Butte, Caribou, Cassia, Clark, Custer, Franklin, Fremont, Jefferson, Lemhi, Madison, Oneida, Power, Teton

Cession 566

Archuleta, Dolores, Hinsdale, La Plata, Mineral, Montezuma, Ouray, San Juan, San Miguel

Cession 586

Moffat, Routt

Cession 609

Archuleta, Conejos, Hinsdale, Mineral, Rio Grande

Cession 616

Delta, Dolores, Eagle, Garfield, Gunnison, Mesa, Montezuma, Montrose, Ouray, Pitkin, Rio Blanco, San Miguel

Cession 617

Archuleta, La Plata, Montezuma