| City : | San Marcos City |
| County : | Baltimore County, Caldwell County, Clark County, Green Lake County, Hays County, Pittsburg County, Shawnee County |
| State : | Texas (TX) |
| | |
| Land Area : | 30.22 sq mi |
| Water Area : | 0.13 sq mi |
| Latitude : | 29.8768979 |
| Longitude : | -97.9315698 |
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| Population (2010): | 44,894 |
| Population Estimate (2012) : | 46,131 |
| Population Density : | 1,485.63/sq mi |
| Housing Units (2012) : | 18,179 |
| Median Household Income (2012) : | $27,360 (Texas : $51,563, USA : $53,046) |
| Median Family Income (2012) : | $48,482 (Texas : $60,621, USA : $64,585) |
| Median House Price (2012) : | $121,200 (Texas : $128,000, USA : $181,400) |