City comparison
Austin, TX is about 30 miles (50 km) from San Marcos, TX in a straight line. By road, the drive is roughly 40 miles, or about 39 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 Austin, TX to San Marcos, TX takes about 4 min, covering roughly 30 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.
Austin has a population of 958,202, vs 67,143 in San Marcos — about 14.3× larger by population. By land area, Austin covers about 325 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 | Austin | San Marcos | Difference |
|---|---|---|---|
| Median rent | $1,549/mo | $1,251/mo | 23.8% higher in Austin |
| Median home value | $461,500 | $248,300 | 85.9% higher in Austin |
| Median household income | $86,556 | $47,394 | 82.6% higher in Austin |
| Groceries index | 94.2 | 94.2 | ≈ equal |
| Utilities index | 83.2 | 83.2 | ≈ equal |
| Transportation index | 96.6 | 96.6 | ≈ equal |
| Healthcare index | 96.1 | 96.1 | ≈ equal |
How much you'd need to earn in the other city to keep the same standard of living.
If you earn $100,000 in Austin, you'd need $99,153 in San Marcos to maintain your standard of living.
Climate, safety, and demographics side by side.
San Marcos, TX is about 0.8% cheaper overall than Austin, TX, based on our cost-of-living index. Housing costs are roughly 2% higher in Austin than in San Marcos. If you earn $80,000 in Austin, you'd need about $79,322 in San Marcos to keep the same standard of living.