All 160 US Counties of Former Mexican Territories in 1854 with a Map

Between 1846 and 1854, the U.S. annexed many territories that had originally belonged to Mexico. Can you name every county that existed in the former Mexican territories in 1854, when the Treaty of Mesilla (Gadsden Purchase) went into effect?
Click on the map to zoom in.
According to MapofUS.org.
Some of these counties no longer exist.
Quiz by
Dekkie
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Last updated: May 2, 2025
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First submittedMay 2, 2025
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Average score22.5%
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California
 
Alameda
 
San Diego
 
Amador
 
San Francisco
 
Butte
 
San Joaquin
 
Calaveras
 
San Luis Obispo
 
Colusa
 
Santa Barbara
 
Contra Costa
 
Santa Clara
 
El Dorado
 
Santa Cruz
 
Humboldt
 
Shasta
 
Klamath
 
Sierra
 
Los Angeles
 
Siskiyou
 
Marin
 
Solano
 
Mariposa
 
Sonoma
 
Mendocino
 
Stanislaus
 
Monterey
 
Sutter
 
Napa
 
Trinity
 
Nevada
 
Tulare
 
Placer
 
Tuolumne
 
Plumas
 
Yolo
 
Sacramento
 
Yuba
 
San Bernardino
 
 
 
Texas
 
Anderson
 
Gillespie
 
Nacogdoches
 
Angelina
 
Goliad
 
Navarro
 
Austin
 
Gonzales
 
Newton
 
Bastrop
 
Grayson
 
Nueces
 
Bell
 
Grimes
 
Orange
 
Bexar
 
Guadalupe
 
Panola
 
Bosque
 
Harris
 
Polk
 
Bowie
 
Harrison
 
Presidio
 
Brazoria
 
Hays
 
Red River
 
Brazos
 
Henderson
 
Refugio
 
Burleson
 
Hidalgo
 
Robertson
 
Burnet
 
Hill
 
Rusk
 
Caldwell
 
Hopkins
 
Sabine
 
Calhoun
 
Houston
 
San Augustine
 
Cameron
 
Hunt
 
San Patricio
 
Cass
 
Jackson
 
Shelby
 
Cherokee
 
Jasper
 
Smith
 
Collin
 
Jefferson
 
Starr
 
Colorado
 
Johnson
 
Tarrant
 
Comal
 
Karnes
 
Titus
 
Cooke
 
Kaufman
 
Travis
 
Coryell
 
Kinney
 
Trinity
 
Dallas
 
Lamar
 
Tyler
 
Denton
 
Lavaca
 
Upshur
 
DeWitt
 
Leon
 
Uvalde
 
El Paso
 
Liberty
 
Van Zandt
 
Ellis
 
Limestone
 
Victoria
 
Falls
 
Madison
 
Walker
 
Fannin
 
Matagorda
 
Washington
 
Fayette
 
McLennan
 
Webb
 
Fort Bend
 
Medina
 
Wharton
 
Freestone
 
Milam
 
Williamson
 
Galveston
 
Montgomery
 
Wood
 
New Mexico Territory
 
Bernalillo
 
Doña Ana
 
Rio Arriba
 
Santa Ana
 
Santa Fe
 
San Miguel
 
Socorro
 
Taos
 
Valencia
 
 
 
Utah Territory
 
Davis
 
Desert
 
Great Salt Lake
 
Green River
 
Iron
 
Juab
 
Millard
 
Sanpete
 
Summit
 
Tooele
 
Utah
 
Washington
 
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6 Comments
+1
Level 81
May 2, 2025
it's tuolumne county
+1
Level 55
May 2, 2025
Fixed.
+1
Level 81
May 2, 2025
Nice quiz. Bernalillo's tiny panhandle is pretty funny-looking. Surely it couldn't have been more than a mile tall.
+1
Level 55
May 2, 2025
Thanks! It looks horrible and I hate it.
+1
Level 40
Oct 30, 2025
why, just why was this made. Its so random for a quiz.
+4
Level 55
Oct 30, 2025
Because it’s historically significant? I don’t think someone with an “All North American Countries” quiz should be talking crap about a quiz’s existence, as if that hasn’t been done over a million times already.