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DENVER — Colorado rents continue to skyrocket and are growing at more than twice the national average, according to a study released Thursday.

Rents were up a staggering 6.2 percent in September compared to September 2014, according to the Colorado Rental Price Monitor from Apartment List.

Rents for one-bedroom units increased by 0.5 percent and two-bedroom rents climbed 0.7 percent between August and September. Compared to September 2014, one-bedroom rents went up 6.1 percent to $1,030 and two-bedroom units climbed 6.2 percent to $1,280.

Boulder remained Colorado’s most expensive city for rents, with the average two-bedroom unit going for a whopping $2,000 a month, up 9.4 percent from last year. One-bedroom rents in Boulder went for an average of $1,650 a month, a 3 percent increase that also placed the city first in the state.

The remainder of the top 10 cities for two-bedroom rents were: Centennial ($1,650), Highlands Ranch ($1,640), Broomfield ($1,590), Lone Tree ($1,570), Denver ($1,530), Englewood ($1,450), Littleton ($1,430), Westminster ($1,370) and Golden ($1,340).

The 10 fastest-growing cities for two-bedroom rents over the past year were Sherrelwood (17 percent), Englewood (9.6 percent), Boulder (9.4 percent), Lakewood (8.9 percent), Lone Tree (8.7 percent), Aurora (8.5 percent), Longmont (8 percent), Colorado Springs (7.1 percent), Westminster (6.9 percent) and Denver (6.5 percent).