Fastest-Appreciating ZIP Codes in Boulder, CO (2026)
Ranked by 5-year compound annual growth in home values. Fast growth and strong cash flow rarely appear in the same ZIP — this is the other side of that trade.
| # | ZIP | City | Home value | Rent | Cap rate | 5-yr growth |
|---|---|---|---|---|---|---|
| 1 | 80503 | Longmont, CO | $739,082 | $1,932 | 2.04% | 2.3% |
| 2 | 80301 | Boulder, CO | $707,635 | $2,314 | 2.55% | 1.9% |
| 3 | 80540 | Lyons, CO | $754,390 | $1,425 | 1.47% | 1.9% |
| 4 | 80305 | Boulder, CO | $983,988 | $2,955 | 2.34% | 1.9% |
| 5 | 80027 | Louisville, CO | $827,433 | $2,491 | 2.35% | 1.9% |
| 6 | 80026 | Lafayette, CO | $671,260 | $2,220 | 2.58% | 1.8% |
| 7 | 80304 | Boulder, CO | $1,229,013 | $2,470 | 1.57% | 1.8% |
| 8 | 80466 | Nederland, CO | $676,606 | $2,375 | 2.74% | 1.6% |
| 9 | 80481 | Ward, CO | $527,181 | $1,791 | 2.65% | 1.4% |
| 10 | 80501 | Longmont, CO | $489,242 | $1,826 | 2.91% | 1.3% |
| 11 | 80302 | Boulder, CO | $1,109,412 | $2,319 | 1.63% | 1.0% |
| 12 | 80303 | Boulder, CO | $820,623 | $2,277 | 2.16% | 0.9% |
| 13 | 80455 | Jamestown, CO | $541,789 | $2,016 | 2.90% | 0.6% |
| 14 | 80510 | Allenspark, CO | $504,253 | $1,809 | 2.80% | 0.1% |
Ranked from Repit’s own ZIP-level data — Zillow home values and rents, HUD fair-market rents where Zillow has no coverage, and U.S. Census vacancy. Cap rate is gross: annual rent over purchase price, before financing and expenses. Every ZIP above links to its full free page. How we calculate this →