Head-to-head comparison
California State University-San Marcos vs Sonoma State University: which has better ROI?
Option A San Marcos, CA
California State University-San Marcos
- Net price / year
- $10,229
- Earnings, 10 years
- $62,908
- Payback
- 2.8 yrs
Option B Rohnert Park, CA
Sonoma State University
- Net price / year
- $12,885
- Earnings, 10 years
- $65,986
- Payback
- 2.9 yrs
California State University-San Marcos has the better ROI: it clears its 4-year net cost of $40,916 in 2.8 years versus 2.9 years at Sonoma State University, on median earnings of $62,908 vs $65,986 ten years out. (Scorecard, 2026 · our math.)
| Measure | California State University-San Marcos | Sonoma State University |
|---|---|---|
| Net price / yr | $10,229 | $12,885 |
| Total net cost | $40,916 | $51,540 |
| Median earnings, 10 yrs | $62,908 | $65,986 |
| Median debt | $17,350 | $16,705 |
| Payback | 2.8 yrs | 2.9 yrs |
| 20-year net return | $250,044 | $300,980 |
College Scorecard (2026), institution-level · payback and returns are our math. Figures blend all majors.
The short answer
Which is cheaper, California State University-San Marcos or Sonoma State University?
California State University-San Marcos, at $10,229 a year after aid versus $12,885 — a gap of $2,656 a year, or $10,624 across the full degree. These are net prices after grants and scholarships, not sticker prices, so they reflect what an aided student pays.
The short answer
Do California State University-San Marcos or Sonoma State University graduates earn more?
Sonoma State University graduates report a median $65,986 ten years after entry, $3,078 more than the $62,908 at California State University-San Marcos. Both are institution-wide medians from federal tax records, so a high-paying major at the lower school can beat the average at the higher one.
The short answer
Which leaves students with less debt, California State University-San Marcos or Sonoma State University?
Sonoma State University: its completers carry a median $16,705 in federal loans versus $17,350 at California State University-San Marcos, a difference of $645. The figure counts students who finished; it excludes private loans and anyone who left before graduating.
The short answer
Which graduates more of its students?
58% of students finish at Sonoma State University, against 55% at California State University-San Marcos. Completion matters to the ROI arithmetic because a degree that is never finished still carries its cost and its debt, but earns none of the graduate premium above the $48,360 high-school baseline.