City comparison
Boulder, CO is about 10 miles (20 km) from Longmont, CO in a straight line. By road, the drive is roughly 20 miles, or about 16 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 Boulder, CO to Longmont, CO takes about 2 min, covering roughly 10 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.
Boulder has a population of 106,598, vs 98,282 in Longmont — about the same size. By land area, Longmont covers about 29 sq mi vs 27 sq mi for Boulder.
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 | Boulder | Longmont | Difference |
|---|---|---|---|
| Median rent | $1,853/mo | $1,689/mo | 9.7% higher in Boulder |
| Median home value | $919,700 | $488,100 | 88.4% higher in Boulder |
| Median household income | $80,243 | $89,720 | 11.8% higher in Longmont |
| Groceries index | 96.8 | 96.8 | ≈ equal |
| Utilities index | 86.5 | 86.5 | ≈ equal |
| Transportation index | 100.3 | 100.3 | ≈ equal |
| Healthcare index | 100.2 | 100.2 | ≈ 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 Boulder, you'd need $99,598 in Longmont to maintain your standard of living.
Climate, safety, and demographics side by side.
Boulder and Longmont have nearly identical overall cost-of-living indices. If you earn $80,000 in Boulder, you'd need about $79,679 in Longmont to keep the same standard of living.