| San Antonio-Castellanos | |
| Native Name Lang: | es |
| Settlement Type: | Urban conurbation |
| Pushpin Map: | Argentina Santa Fe Province#Argentina |
| Pushpin Map Caption: | Location of San Antonio-Castellanos |
| Coordinates: | -31.2108°N -61.725°W |
| Subdivision Type: | Country |
| Subdivision Name: | Argentina |
| Subdivision Type1: | Province |
| Subdivision Name1: | Santa Fe |
| Subdivision Type2: | Department |
| Subdivision Name2: | Castellanos |
| Leader Title: | Mayor |
| Unit Pref: | Metric |
| Population Total: | 752 |
| Population As Of: | 2010 |
| Population Density Km2: | auto |
| Timezone1: | ART |
| Utc Offset1: | -3 |
| Postal Code Type: | CPA base |
| Postal Code: | S2301 |
| Area Code Type: | Dialing code |
San Antonio-Castellanos is an urban conurbation the Castellanos Department, in Santa Fe Province in northeastern Argentina. It extends between the localities of San Antonio and Castellanos.
Considered as an urban agglomeration by INDEC since 2001, according to the results of the 2010 census, San Antonio-Castellanos had a population 752 inhabitants, which represented an increase compared to the previous census that had 723 inhabitants.
| Locality | Department | 2010 Census | 2001 Census | 1991 Census | |
|---|---|---|---|---|---|
| San Antonio[1] | Castellanos | 412 | 409 | 456 | |
| Castellanos[2] | Castellanos | 340 | 314 | 353 | |
| Total | 752 | 723 | 809 |