The Colorado state emissions testing program covers the counties of Adams, Arapahoe, Boulder, Denver, Douglas, Larimer, Weld, Jerrerson, and Broomfield.  The rural areas of Adams and Arapahoe counties east of Kiowa Creek are excluded.

There are eighteen emissions testing service centers that all vehicles may be tested at.  If your vehicle is from 1981 or prior it may be tested at an independent testing location.  If you need information on testing centers you can call 1-303-692-3270 or if you have a diesel powered vehicle you would call 1-303-205-5603.

Below are the 18 emissions testing service centers in Colorado:

Longmont:

Address: 4040 Rogers Rd.,
Longmont, CO 80503
Lanes: 3
Phone: 303-456-7090
Hours of Operation: 8am to 5:30pm (M-F),
8am to 1pm (Sat), closed Sunday and state holidays

Northglenn:
Address: 1950 E. 112th Ave.,
Northglenn, CO 80233
Lanes: 7
Phone: 303-456-7090
Hours of Operation: 8am to 5:30pm (M-F),
8am to 1pm (Sat), closed Sunday and state holidays

County Line:
Address: 8494 S. Colorado Blvd.,
Littleton, CO 80126
Lanes: 5
Phone: 303-456-7090
Hours of Operation: 8am to 5:30pm (M-F),
8am to 1pm (Sat), closed Sunday and state holidays

Broomfield:
Address: 11609 Teller St.,
Broomfield, CO 80020
Lanes: 4
Phone: 303-456-7090
Hours of Operation: 8am to 5:30pm (M-F),
8am to 1pm (Sat), closed Sunday and state holidays

Boulder:
Address: 5655 Airport Blvd.,
Boulder, CO 80301
Lanes: 5
Phone: 303-456-7090
Hours of Operation: 8am to 5:30pm (M-F),
8am to 1pm (Sat), closed Sunday and state holidays

Denver (Lipan):
Address: 2300 S. Lipan St.,
Denver, CO 80223
Lanes: 7
Phone: 303-456-7090
Hours of Operation: 8am to 5:30pm (M-F),
8am to 1pm (Sat), closed Sunday and state holidays

Loveland:
Address: 7001 N. Franklin Ave.,
Loveland, CO 80538
Lanes: 4
Phone: 970-247-8378
Hours of Operation: 8am to 5:30pm (M-F),
8am to 1pm (Sat), closed Sunday and state holidays

Parker:
Address: 10199 Park Glen Way, Parker, CO 80134
Lanes: 2
Phone: 303-456-7090
Hours of Operation: 8am to 5:30pm (M-F),
8am to 1pm (Sat), closed Sunday and state holidays

Arvada:
Address: 5185 Marshall St.,
Arvada, CO 80002
Lanes: 7
Phone: 303-456-7090
Hours of Operation: 8am to 5:30pm (M-F),
8am to 1pm (Sat), closed Sunday and state holidays

Golden:
Address: 15335 W. 44th Ave.,
Golden, CO 80401
Lanes: 4
Phone: 303-456-7090
Hours of Operation: 8am to 5:30pm (M-F),
8am to 1pm (Sat), closed Sunday and state holidays

Ken Caryl:
Address: 10727 Centennial Rd.,
Littleton, CO 80127
Lanes: 5
Phone: 303-456-7090
Hours of Operation: 8am to 5:30pm (M-F),
8am to 1pm (Sat), closed Sunday and state holidays

Fort Collins:
Address: 835 S. Frontage Rd.,
Ft. Collins, CO 80524
Lanes: 6
Phone: 970-247-8378
Hours of Operation: 8am to 5:30pm (M-F),
8am to 1pm (Sat), closed Sunday and state holidays

Castle Rock:
Address: 541 Topeka Way, Castle Rock, CO 80104
Lanes: 2
Phone: 303-456-7090
Hours of Operation: 8am to 5:30pm (M-F),
8am to 1pm (Sat), closed Sunday and state holidays

Sheridan:
Address: 2802 W. Mansfield Ave.,
Sheridan, CO 80110
Lanes: 7
Phone: 303-456-7090
Hours of Operation: 8am to 5:30pm (M-F),
8am to 1pm (Sat), closed Sunday and state holidays

Stapleton:
Address: 12042 E. 30th Ave.,
Aurora, CO 80010
Lanes: 6
Phone: 303-456-7090
Hours of Operation: 8am to 5:30pm (M-F),
8am to 1pm (Sat), closed Sunday and state holidays

Dacono:
Address: 5222 Silver Peak Ave.,
Dacono, CO 80514
Lanes: 2
Phone: 303-456-7090
Hours of Operation: 8am to 5:30pm (M-F),
8am to 1pm (Sat), closed Sunday and state holidays

Denver SE (Warren):
Address: 10190 E. Warren Ave.,
Denver, CO 80231
Lanes: 7
Phone: 303-456-7090
Hours of Operation: 8am to 5:30pm (M-F),
8am to 1pm (Sat), closed Sunday and state holidays

Greeley:
Address: 2844 W. 30th St.,
Greeley, CO 80631
Lanes: 5
Phone: 970-247-8378
Hours of Operation: 8am to 5:30pm (M-F),
8am to 1pm (Sat), closed Sunday and state holidays