Longmont is a Home Rule Municipality in Boulder and Weld counties in the U.S. state of Colorado. Longmont is located in Northern Colorado. Longmont is the 13th most populous city in the State of Colorado. The word "Longmont" comes from Longs Peak, a prominent mountain named for explorer Stephen H. Long that is clearly visible from Longmont, and "mont" from the French word for mountain. The city is located northeast of the county seat of Boulder and 31 miles (50 km) north-northwest of the Colorado State Capitol in Denver. In contrast to its better-known neighbor, Longmont has a much more quiet and residential feel, although the city has begun to grow rapidly in recent years. The population was 86,270 at the 2010 census.