Cole & Hitch has delivered two criminals to mexican lawmen in Nuevo Laredo - "Our job was to collect two Mexican Wall Street con artists and deliver them to Mexican authorities in Nuevo Laredo." (chapter 2, Ironhorse)

After that, they spend a little time in the border town. They played cards, drinking whiskey and then visited the Nuevo Laredo train station.

El Encanto is a fictional border village in the state of New Mexico. El Encanto plays a minor role in "Bull River".

There isn't much to see. El Encanto has a plaza, a corral, a few saloons, and an whorehouse.

San Cristobal is a small fictional border town. "San Cristóbal was a stately community built on rolling hills nestled in the San Cristóbal River Valley between two mountain ranges, the Angeles Altos and the Blue Ridge." (chapter 5, Bull River)

Church

Railway station

Courthouse

Sheriff's Office

Montezuma Hotel

Comstock National Bank

Harvey House Hotel

Claremont Restaurant

Benedict Arnold's place (saloon)

Holly Hotel

Sixth Street

Main Street

Ira Cross

Judge Bing

La Mesilla is a town in Dona Ana County, New Mexico. It is part of the Las Cruces Metropolitan area. The population was around 2.000 after the last cencus.

Everett Virgil visits La Mesilla in "Bull River".

La Mesilla was a crossroads town, the intersection of the Butterfield and the Santa Fe stage lines, and was the destination of many, but mostly young men seeking festivities. It was a happy, lively place, with more drinking, gambling, and whoring than most towns its size. In fact, you could even say the major commerce in La Mesilla was drinking, gambling, and whoring. The town was spread out and the place was open for business twenty-four hours a day. (chapter 36)