Alameda County, California ("Boulevard with Poplars")
Alamosa County, Colorado ("Shaded with Poplars or Cottonwoods")
Amador County, California (named for José María Amador, amador is the Spanish word for "lover")
Angelina County, Texas (From "Ángelina," a Spanish given name. Its English equivalent is "Angeline")
Archuleta County, Colorado (From "Archuleta," a Spanish surname)
Atascosa County, Texas ("Boggy")
Baca County, Colorado (named in honor of pioneer and Colorado territorial legislator Felipe Baca)
Bandera County, Texas ("Flag")
Bernalillo County, New Mexico
Bexar County, Texas (Béxar is an ancient form for Béjar)
Bosque County, Texas ("Forest")
Brazos County, Texas ("Arms")
Buena Vista County, Iowa ("Good View")
Calaveras County, California (named after the Calaveras River; Spanish word for "Skulls")
Chaves County, New Mexico ("Keys")
Colusa County, California (from two Mexican land grants; Coluses (1844) and Colus (1845))
Conejos County, Colorado (named after the Conejos River meaning "Rabbits")
Contra Costa County, California ("Opposite Coast" in Spanish; in reference to its location in the San Francisco Bay Area)
Costilla County, Colorado (named after the Costilla River, meaning "Little Coast" or "Rib")
DeSoto County, Florida (named after the Spanish explorer Hernando de Soto)
DeSoto County, Mississippi (named after the Spanish explorer Hernando de Soto)
Del Norte County, California ("Northern" in Spanish, also the northernmost county in California)
Dolores County, Colorado (derived from "Nuestra Señora de los Dolores", Spanish name for Our Lady of Sorrows)
Doña Ana County, New Mexico (Mrs. Anne)
El Dorado County, California (From the mythical El Dorado, The Gilded One, significant to El Dorado County's importance in the California Gold Rush)
El Paso County, Colorado ("The step" or "the pass")
Escambia County, Florida (named for the Escambia River, whose name comes from a Spanish word for "barter" or "trade")
Esmeralda County, Nevada ("Emerald")
Fresno County, California (From Fresno Creek. In Spanish, fresno means "ash tree".)
Garza County, Texas (named in honor to the family of landowner José Antonio de la Garza).
Gonzales County, Texas
Hernando County, Florida (named after Spanish explorer Hernando de Soto)
Hidalgo County, New Mexico ("Nobleman of the lowest grade")
Hidalgo County, Texas
Huerfano County, Colorado (named for the Huerfano Butte, a local landmark. From the Spanish huérfano, meaning orphan)
Las Animas County, Colorado (named after the Animas River, derived from Río de las Ánimas Perdidas, which means "River of the Lost Souls")
La Paz County, Arizona ("Peace")
La Plata County, Colorado (Called so for La Plata River (San Juan River), in Colorado. From the Spanish plata, meaning "silver")
Leon County, Florida (named for Spanish explorer Juan Ponce de León; it is his surname, which means lion)
Los Alamos County, New Mexico ("The white poplars")
Los Angeles County, California (Spanish for "the Angels", from one of the 28 settlements founded by the Spanish, El Pueblo de Nuestra Señora la Reina de los Ángeles del Río de Porciúncula)
Madera County, California ("Wood" or "Timber")
Matagorda County, Texas ("Fat shrub")
Maricopa County, Arizona
Mariposa County, California ("Butterfly")
Mendocino County, California (from Cape Mendocino, named probably for either Antonio de Mendoza or Lorenzo Suárez de Mendoza, viceroys of New Spain)
Mesa County, Colorado (table)
Merced County, California (from the Merced River, a shortened version of the original name El Río de Nuestra Señora de la Merced (River of Our Lady of Mercy); named in 1806 by an expedition headed by Gabriel Moraga)
Monterey County, California (from Monterey Bay—the name is composed of the Spanish words Monte ("Hill") and Rey ("King"), historically because the viceroy of New Spain (Mexico) that supported the expedition of California, was from Monterey, Galicia, Spain)
Mora County, New Mexico (Blackberry or Moor woman)
Natrona County, Wyoming ("Natron")
Nevada County, California ("Snowy")
New Madrid County, Missouri (called so after the Spanish capital Madrid)
Nueces County, Texas (named after the Nueces River, meaning "nuts", derived from pecan nuts)
Otero County, Colorado (the county was named for Miguel Antonio Otero (born 1829), one of the founders of the town of La Junta and a member of a prominent Hispanic family)
Palo Alto County, Iowa - (of Spanish "tall stick"; It is named for the first battlefield victory in the Mexican–American War).
Palo Pinto County, Texas ("Colored stick")
Pinellas County, Florida (named after "La Punta de Piñal de Jimenez", which means "Jimenez's Point of Pines", after the entrance to Tampa Bay by Spanish explorers in 1757)
Plumas County, California (for the Feather River. Plumas is the Spanish word for feathers.)
Pueblo County, Colorado (village)
Presidio County, Texas ("Presidio")
Refugio County, Texas ("Shelter")
Rio Arriba County, New Mexico ("Upstream", referring to the stream of a river)
Rio Grande County, Colorado ("Big River")
Sacramento County, California (from the Sacramento River, itself named for the Santísimo Sacramento (Spanish for Most Holy Sacrament), a reference to the Eucharist)
San Benito County, California (in honor of San Benedicto (Saint Benedict); "Benito" is the diminutive of Benedicto)
San Bernardino County, California (Saint Bernardino of Siena)
St. Bernard Parish, Louisiana (called so after St. Bernard, the patron saint of Spanish colonial governor of Louisiana in 1780s Bernardo de Gálvez).
San Diego County, California (from the city of San Diego, itself named after Saint Didacus of Alcalá, or San Diego de Alcalá in Spanish)
Sandoval County, New Mexico (Named for the Sandoval family, prominent seventeenth-century Spanish landowners)
San Francisco County, California (from the city of San Francisco, itself named after Francis of Assisi (1181–1226), a Roman Catholic saint and founder of the Order of Friars Minor (Franciscans))
San Jacinto County, Texas (for Saint Hyacinth)
San Joaquin County, California (for Saint Joachim)
San Juan County, Colorado
San Juan County, New Mexico
San Juan County, Utah (named after the San Juan River, meaning "St. John")
San Juan County, Washington (named for Juan Vicente de Güemes, 2nd Count of Revillagigedo, Viceroy of New Spain)
San Luis Obispo County, California (for St. Louis, the Bishop)
San Mateo County, California (for Saint Matthew)
San Miguel County, Colorado (from the San Miguel River in Colorado)
San Miguel County, New Mexico
San Patricio County, Texas (for Saint Patrick)
Santa Ana, California
Santa Barbara County, California (for Saint Barbara)
Santa Clara County, California (for Saint Clare, for the Santa Clara Valley and the mission town of Santa Clara)
Santa Fe County, New Mexico (Saint Faith)
Santa Cruz County, Arizona
Santa Cruz County, California (Spanish for "Holy/Sacred Cross")
Santa Rosa County, Florida (named after Santa Rosa Island, which means "Saint Rose")
Sebastian County, Arkansas
Sierra County, California ("Mountain range")
Solano County, California (the county derives its name directly from an Amerindian Chief, Chief Solano of the Suisun people, a Native American tribe of the region and Vallejo's close ally. The Chief was given the Spanish name Francisco Solano during baptism at the Catholic Mission, and is named after the Spanish Franciscan missionary, Father Francisco Solano. "Solano" is a common surname in the north of Spain, especially in Navarra, Zaragoza, and La Rioja)
Uvalde County, Texas
Valencia County, New Mexico (Spanish city of Valencia)
Val Verde County, Texas
Ventura County, California (named after the county seat, the city of Ventura which is named after "Saint Bonaventure," a Catholic medieval mystic)
Victoria County, Texas (Spanish family name, meaning "victory")
Ysleta Mission, Texas ("Little Island")
Zapata County, Texas (Spanish family name, "Espadrille")