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Treaties
Louisiana Purchase

Counties per Cession
Cession
Cession 120
Counties
Lee

Cession
Cession 151
Counties
Adair, Adams, Audubon, Buena Vista, Calhoun, Carroll, Cass, Cherokee, Clay, Crawford, Dickinson, Emmet, Fremont, Guthrie, Harrison, Humboldt, Ida, Lyon, Mills, Monona, Montgomery

Cession
Cession 152
Counties
Allamakee, Bremer, Butler, Chickasaw, Clayton, Fayette, Floyd, Franklin, Hamilton, Hardin, Webster, Winneshiek, Wright

Cession
Cession 153
Counties
Allamakee, Cerro Gordo, Chickasaw, Floyd, Franklin, Hancock, Howard, Humboldt, Kossuth, Mitchell, Winneshiek, Wright, Fillmore, Houston

Cession
Cession 175
Counties
Buchanan, Cedar, Clayton, Clinton, Delaware, Des Moines, Dubuque, Fayette, Jackson, Jefferson, Johnson, Jones, Lee, Linn, Louisa, Muscatine, Scott, Van Buren, Washington

Cession
Cession 226
Counties
Des Moines, Johnson, Louisa, Muscatine, Washington

Cession
Cession 244
Counties
Benton, Buchanan, Davis, Fayette, Iowa, Jefferson, Johnson, Keokuk, Linn, Van Buren, Washington

Cession
Cession 262
Counties
Adair, Appanoose, Benton, Black Hawk, Boone, Buchanan, Calhoun, Carroll, Clarke, Dallas, Davis, Decatur, Greene, Grundy, Guthrie, Hamilton, Hardin, Iowa, Jasper, Jefferson, Keokuk, Lucas

Cession
Cession 265
Counties
Adair, Adams, Audubon, Buena Vista, Calhoun, Carroll, Cass, Cherokee, Clay, Crawford, Dickinson, Emmet, Fremont, Guthrie, Harrison, Humboldt, Ida, Mills, Monona, Montgomery

Cession
Cession 267
Counties
Allamakee, Chickasaw, Clayton, Fayette, Howard, Winneshiek, Fillmore, Houston

Cession
Cession 289
Counties
Dickinson, Emmet, Hancock, Howard, Humboldt, Kossuth, Lyon, Mitchell, Osceola, Palo Alto, Pocahontas, Winnebago, Worth, Big Stone, Blue Earth, Brown, Carver, Chippewa, Clay, Cottonwood