| Number | County | Town | Size | Built | Verif | GPS | Description |
| CO-03-01 | Arapahoe | Aurora | 200 S. Chambers Rd. True round barn, white siding. (N39 42.798 W104 48.481) | ||||
| CO-03-02 | Denver | 06-2005 | N39 44.83 W105 01.18 | In Denver. Bryant St. N. 0.1 miles from jct with I25 exit 210 in Denver to the hotel on the W. side of the road at 1975. Red Lion Hotel, round tower. | |||
| CO-03-03 | Denver | 1999 | 06-2005 | N39 44.64 W105 01.22 | In Denver. At the NW corner of I25 & Bus.I70 (CO40 or Colfax Av.). Mile High Stadium, oval bldg, open top. | ||
| CO-03-04 | Denver | 06-2005 | N39 44.72 W104 58.14 | In Denver. Bus.I70 (CO40 or Colfax Av.) E. 2.4 miles from jct with I25 exit 210 in Denver, N. on Franklin St. 0.35 (3 blocks) miles to the hospital on the W. side of the road. St. Joseph Hospital, round tower. | |||
| CO-03-05 | Denver | 06-2005 | N39 44.88 W104 58.10 | In Denver. Bus.I70 (CO40 or Colfax Av.) E. 2.4 miles from jct with I25 exit 210 in Denver, N. on Franklin St. 0.55 (5 blocks) miles to the hospital on the E. side of the road. Presbyterian St. Lukes Medical Center, oval tower. | |||
| CO-03-06 | Denver | 04-2022 | N39 45.567 W105 00.665 | In Denver. Central St. SW 0.3 miles from jct with I25 exit 242, NW on 16th St. 0.1 miles to the bldg on the SW side of the road at 2620. Little Man Ice Cream, true round bldg, looks like milk can. | |||
| CO-03-07 | Denver | 1999 | 04-2033 | N39 44.921 W105 00.457 | In Denver. Speer Blvd SE 0.55 miles from jct with I35 exit 212, SW on Chopper Cir 0.2 miles to the bldg on the NW side of the road. Ball Arena, oval bldg. | ||
| CO-07-01 | Boulder | Jamestown | ESE of Jamestown. Mill St. (becomes James Canyon Dr.) ESE 2.5 miles from jct with Main St. in Jamestown to the house on the S. side of the road at 379. Octagon house. (N40 06.277 W105 20.805) | ||||
| CO-07-02 | Jamestown | 40' | 2015 | 01-2015 | N40 07.430 W105 23.926 | N. of Jamestown. James Canyon Dr. N. 0.7 miles from jct with Ward St. on the N. side of Jamestown to the house on the W. side of the road at 3315. Owners Elizabeth & Kim Matthews. Octavia, octagon house, large windowed cupola w/flat roof, carport attached to one side. | |
| CO-07-?1 | Boulder | W. of Boulder. 3476 Sunshine Canyon Dr. Starhouse, 12-sided bldg. See http://thestarhouse.net for directions. (N40 02.894 W105 19.573) | |||||
| CO-07-?2 | Boulder | 1907 | In Boulder. 821 Lincoln Pl. Octagon house, 2-story. Built by Benjamin Franklin Gregg. (N40 00.134 W105 16.884) | ||||
| CO-19-01 | Eagle | Vail | 04-2022 | N39 38.512 W106 22.562 | In Vail. At the SW corner of Meadow Dr. & Willow Bridge Rd. | ||
| CO-21-?1 | El Paso | Pikeview | 12-2007 | N. of Pikeview. Interquest Pkwy E. 0.9 miles from jct with I25 exit 153 N. of Pikeview, N. on Voyager Pkwy 0.1 miles to the church on the E. side of the road at 11025. New Life, hexagon church. (N38 59.520 W104 47.727) | |||
| CO-29-01 | Jackson | Jackson | 35' | 06-2013 | N40 51.731 W106 19.432 | W. of Cowdrey. CR6W W. 0.6 miles from jct with CO125 in Cowdrey to the house on the N. side of the road. Geodesic house. | |
| CO-30-01 | Jefferson | Lakewood | 232' x 60' | 2008 | 04-2022 | N39 42.704 W105 05.845 | In Lakewood. Alameda Av. W. 0.85 miles from jct with Wadsworth Blvd to the church on the N. side of the road. Mile Hi true round church, dome. |
| CO-30-02 | Lakewood | 04-2022 | N39 42.699 W105 05.913 | In Lakewood. Alameda Av. W. 0.9 miles from jct with Wadsworth Blvd to the bldg on the N. side of the road. Auditorium/Chapel, oval bldg. | |||
| CO-30-03 | Edgemont | 04-2022 | N39 43.789 W105 09.267 | In Golden. Indiana St. N. 0.15 miles from jct with US6, E. on 7th Av. 0.6 miles, N. on Deframe St. 0.2 miles to the house on the W. side of the road at 875. Octagon house. | |||
| CO-30-04 | Edgemont | 04-2022 | N39 43.870 W105 08.912 | In Golden. Indiana St. N. 0.15 miles from jct with US6, E. on 7th Av. 0.65 miles, N. on Coors St. 1 block, E. on 8th Av. 0.2 miles, N. on Beech St. 0.2 miles, E. (right, curves S.) on Abutus Ct. 120yds to the turret on the E. side of the road at 938. Octagon turret. | |||
| CO-30-05 | Edgemont | 04-2022 | N39 43.817 W105 12.109 | In Edgemont. Johnson Rd. N. 0.3 miles from jct with US6 (6th Av.), W. on Jefferson County Pkwy 0.25 miles, N. on Weimer St. 250' to the bldg on the E. side of the road, S. bldg. Men's Jail, round bldg. | |||
| CO-30-06 | Edgemont | 04-2022 | N39 43.851 W105 12.111 | In Edgemont. Johnson Rd. N. 0.3 miles from jct with US6 (6th Av.), W. on Jefferson County Pkwy 0.25 miles, N. on Weimer St. 250' to the bldg on the E. side of the road, N. bldg. Women's Jail, round bldg. | |||
| CO-30-07 | Edgemont | 04-2022 | N39 43.874 W105 09.375 | In Edgemont. Indiana St. N. 0.3 miles from jct with US6, E. (curves N.) on Colorado Mills Pkwy 0.6 miles, W. (left) 200' to the turret ahead. Round turret. | |||
| CO-30-08 | Golden | 1993 | 04-2022 | N39 43.692 W105 12.100 | In Edgemont. Johnson Rd. N. 0.1 miles from jct with US6 (6th Av.), W. on Jefferson County Pkwy 0.15 miles to the courthouse. Courthouse, true round bldg. | ||
| CO-30-09 | Edgemont | 1986 | 04-2022 | N39 43.833 W105 12.036 | In Edgemont. Johnson Rd. N. 0.3 miles from jct with US6 (6th Av.), W. on Jefferson County Pkwy 0.1 miles to the bldg on the N. side of the road. County Jail, true round bldg. | ||
| CO-32-?1 | Kit Carson | Burlington | In Burlington. W. of 15th St. 0.1 miles N. of US385. 12-sided building used to house a carousel. (N39 18.547 W102 16.243) | ||||
| CO-33-01 | La Plata | Durango | 09-2008 | N37 16.799 W107 56.381 | At Durango Silver Co. W. of Durango. US160 W. 3.6 miles from jct with US550 on the SW side of Durango to the bldg on the N. side of the road. Octagon bldg. | ||
| CO-35-?1 | Larimer | Loveland | 1901 | In Loveland. 746 N Washington Av. Hexagon house. Built by William McCreery. (N40 23.969 W105 04.217) | |||
| CO-39-01 | Mesa | Redlands | 04-2022 | N39 06.143 W108 41.708 | NW of Redlands. CO340 (Broadway) NW 3.85 miles from jct with Redlands Pkwy in Redlands, left 120 yds to the turret on the right side of the road at 1917. 10 sided turret. | ||
| CO-42-01 | Montezuma | Mancos | The Hogan Trading Post W. of Mancos. US160 SW 1.6 miles from jct with Bus.US160 just W. of Mancos to the bldg on the NW side of the road. Round bldg. (N37 19.941 W108 20.351) | ||||
| CO-42-02 | Mancos | N37 15.458 W108 29.873 | SW of Mancos. US160 W. 5.7 miles from jct with Bus.US160 just W. of Mancos, S. on CO10 (Ruins Rd.) 14.0 miles to the bldg on the left side of the road. Far View Visitor Center, round bldg. | ||||
| CO-47-01 | Park | Bailey | N39 25.234 W105 25.459 | NE of Bailey. US285 NE 2.1 miles from jct with Wellington Lake Rd. on the W. side of Bailey, exit, E. on CR72 2.3 miles, S. (right) on Mockingbird Trl 220' to the barn on the E. side of the road at 102. True round barn, cupola, poor condition. | |||
| CO-47-?1 | Park | Beulah | In Beulah. Hexagon house. (N38 04.560 W104 58.775) | ||||
| CO-49-?1 | Pitkin | Snowmass | In Gateway Subdivision S. of Snowmass. Several units with each round building a separate room and all rooms connected together with hallways. (N39 18.689 W106 59.255) | ||||
| CO-49-?2 | Snowmass | Same as CO-49-?1. Round house. (N39 18.601 W106 59.300) | |||||
| CO-49-?3 | Snowmass | Situated atop a high bluff, it can be seen from CO82. Octagon house. | |||||
| CO-58-?1 | Sedgewick | Julesburg | S. of Julesburg. E. side US385 0.9 miles N. of I76. Round bldg. (N40 58.769 W102 15.310) | ||||
| CO-60-01 | Teller | Cripple Creek | S. of Cripple Creek. Masonic Av. W. 0.45 miles from jct with CO67 in Cripple Creek, S. on C St. 0.25 miles, SW on Thurlow Av. (becomes CR89) 0.3 miles, S. on dirt road 0.35 miles, left branch at Y 0.15 miles to the house on the E. side of the road. Round house. (N38 44.015 W105 11.304) | ||||
| CO-62-?1 | Weld | Greeley | In Greeley. 1221 9th Av. Currier Inn, octagon house, B&B. (N40 25.123 W104 41.585) | ||||
| CO-63-01 | Yuma | Laird | 1880 | 01-2009 | N40 04.75 W102 06.19 | In Laird. Campbell Av. S. 0.15 miles from jct with US34 in Laird, continue S. on driveway 250' to the house. Octagon house, stone, 2 story, porch encircles house, widow's walk, rectangular addition to the N. Built by Burton Durward Prentice. 1-22-09: Owned by Caribou Cattle Co., Boulder, CO. | |
| CO-63-?1 | Wray | In Wray. Round bldg. (N40 04.694 W102 13.467) |