City comparison
Dallas, TX is about 225 miles (350 km) from San Marcos, TX in a straight line. By road, the drive is roughly 275 miles, or about 4 h 30 min behind the wheel at highway speeds.
Driving distance is a rough estimate (great-circle × 1.25); driving time assumes a 60 mph blended average. Real trips run 10–20% longer with stops.
A direct flight from Dallas, TX to San Marcos, TX takes about 26 min, covering roughly 225 miles in a straight line. Connecting itineraries with a layover typically add 1–3 hours.
Block-to-block estimate at ~500 mph cruise, including taxi, climb, and descent — what an airline would publish, not pure airborne time.
Dallas has a population of 1,300,642, vs 67,143 in San Marcos — about 19.4× larger by population. By land area, Dallas covers about 340 sq mi vs 40 sq mi for San Marcos.
Population from US Census ACS. Land area from the Census Gazetteer (city proper, excluding inland water).
Cost indices by category, with the US city average (100) marked.
Index: 100 = US city average. Lower is more affordable.
Side-by-side costs, salaries, and sub-category indices.
| Metric | Dallas | San Marcos | Difference |
|---|---|---|---|
| Median rent | $1,305/mo | $1,251/mo | 4.3% higher in Dallas |
| Median home value | $270,700 | $248,300 | 9.0% higher in Dallas |
| Median household income | $63,985 | $47,394 | 35.0% higher in Dallas |
| Groceries index | 101.7 | 94.2 | 8.0% higher in Dallas |
| Utilities index | 89.3 | 83.2 | 7.3% higher in Dallas |
| Transportation index | 98.5 | 96.6 | 2.0% higher in Dallas |
| Healthcare index | 99.7 | 96.1 | 3.7% higher in Dallas |
How much you'd need to earn in the other city to keep the same standard of living.
If you earn $100,000 in Dallas, you'd need $98,320 in San Marcos to maintain your standard of living.
Climate, safety, and demographics side by side.
San Marcos, TX is about 1.7% cheaper overall than Dallas, TX, based on our cost-of-living index. If you earn $80,000 in Dallas, you'd need about $78,656 in San Marcos to keep the same standard of living.