| Zip Code : | 78656 |
| City : | San Marcos city |
| County : | Caldwell County, Hays County |
| State : | Texas (TX) |
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| Land Area : | 21.45 sq mi |
| Water Area : | 0.12 sq mi |
| Latitude : | 29.9047585 |
| Longitude : | -97.8072961 |
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| Population (2010): | 2,271 |
| Population Estimate (2012) : | 2,445 |
| Population Density : | 105.86/sq mi |
| Housing Units (2012) : | 833 |
| Median Household Income (2012) : | $39,375 (Texas : $51,563, USA : $53,046) |
| Median Family Income (2012) : | $55,074 (Texas : $60,621, USA : $64,585) |
| Median House Price (2012) : | $67,100 (Texas : $128,000, USA : $181,400) |