City comparison
Houston, TX is about 150 miles (250 km) from San Marcos, TX in a straight line. By road, the drive is roughly 200 miles, or about 3 h 15 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 Houston, TX to San Marcos, TX takes about 18 min, covering roughly 150 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.
Houston has a population of 2,296,253, vs 67,143 in San Marcos — about 34.2× larger by population. By land area, Houston covers about 640 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 | Houston | San Marcos | Difference |
|---|---|---|---|
| Median rent | $1,235/mo | $1,251/mo | 1.3% higher in San Marcos |
| Median home value | $235,000 | $248,300 | 5.7% higher in San Marcos |
| Median household income | $60,440 | $47,394 | 27.5% higher in Houston |
| Groceries index | 100.4 | 94.2 | 6.6% higher in Houston |
| Utilities index | 96.3 | 83.2 | 15.8% higher in Houston |
| Transportation index | 95.8 | 96.6 | 0.9% higher in San Marcos |
| Healthcare index | 95.2 | 96.1 | 1.0% higher in San Marcos |
How much you'd need to earn in the other city to keep the same standard of living.
If you earn $100,000 in Houston, you'd need $104,232 in San Marcos to maintain your standard of living.
Climate, safety, and demographics side by side.
Houston, TX is about 4.1% cheaper overall than San Marcos, TX, based on our cost-of-living index. Housing costs are roughly 14% higher in San Marcos than in Houston. If you earn $80,000 in Houston, you'd need about $83,386 in San Marcos to keep the same standard of living.