New Mexico Territory
1850 Counties
| County | Description | Area in sq miles | Courts held at | Pop in 1850 |
| Bernalillo Co | eastern part | blank | main town Albuquerque | 7,751 |
| San Miguel | central part | blank | Las Vegas | 7,074 |
| Santa Anna | blank | blank | not given | 4,645 |
| Santa Fe | northern part, on western side of the Rocky mountains, water by Rio Grande del Norte | blank | Santa Fe | 7,713 |
| Socorro | in southern part, crossed by Rio Grande del Norte | blank | Socorro | not listed |
1850 Towns
| Name | What | County | Pop | Other |
| Fort Union | PO | not given | ||
| Las Vegas | PO | not given | ||
| San Elizario | PO | Socorro | ||
| San Miguel | PT | San Miguel | 700 | |
| Santa Fe | City | Santa Fe | abt 5,000 | seat of justice |
| Socorro | PO | Socorro | ||
| Tecolita | PO | San Miguel |
Note: the US obtain this area in 1848 and it became a territory in 1850