| Number | County | Town | Size | Built | Verif | GPS | Description |
| NH-02-01 | Carroll | Glen | 12-2020 | N44 07.079 W71 11.007 | At Living Shores Aquarium N. of Glen, Bartlett Township. NH16 N. 0.5 miles from jct with US302 in Glen to the bldg on the E. side of the road. Round bldg, mostly glass. Glass has since been covered. | ||
| NH-02-02 | West Ossipee | 12-2020 | N43 50.302 W71 12.503 | N. of West Ossipee, Tamworth Township. NH16 (White Mountain Hwy) N. 1.05 miles from jct with NH41 (Plains Rd.) in West Ossipee to the bldg on the W. side of the road. | |||
| NH-02-03 | Wolfeboro | 1870 | 10-2022 | N43 34.905 W71 12.202 | In Wolfeboro. At the S. corner of Main & Green Sts. at 217 Main St. Octagon house, 2 story. Now First Church of Christ Scientist. | ||
| NH-02-04 | Wolfeboro | 10-2022 | N43 34.891 W71 12.174 | In Wolfeboro. On the SW side of Main St. 1/3 block NW of Clark Rd. Octagon turret. | |||
| NH-02-05 | Sanbornville | 10-2023 | N43 34.498 W71 02.224 | N. of Sanbornville, Wakefield Township. Meadow St. W. 0.75 miles from jct with Wakefield Rd. in Sanbornville, N. on Whitemountain Hwy 1.7 miles to the bldg on the W. side of the road. Hexagon bldg. | |||
| NH-03-01 | Cheshire | Winchester | 11-2029 | N42 46.377 W72 23.009 | In Winchester. At the S. corner of Richmond Rd. & Main St. Town Hall, octagon bldg. | ||
| NH-04-01 | Coos | Columbia | Gone | GONE | E. of Columbia. True round, white, 2-pitch conical roof, octagon cupola, 4 small dormers. Fell down in the 70s or early 80s due to neglect. Built by James Kelsea. | ||
| NH-04-02 | Jefferson | c1897 | 12-2020 | N44 22.310 W71 24.447 | SE of Jefferson, Jefferson Township. US2 SE 4.7 miles from jct with Meadows Rd. in Jefferson to the bldg on the SW side of the road. Carter's Tower, true round bldg, stone. | ||
| NH-04-03 | Twin Mountain | 12-2020 | N44 16.317 W71 32.409 | In Twin Mountain. US302 W. 0.2 miles from jct with US3, E. (sharp right) on School St. 0.15 miles to the bldg on the S. side of the road. Information, 12 sided bldg. | |||
| NH-04-04 | Lancaster | 12-2020 | N44 28.237 W71 32.707 | SE of Lancaster, Lancaster Township. US2 SE 4.6 miles from jct with US3 in Lancaster to the house on the NE side of the road at 232. True round house, rectangular garage attached. | |||
| NH-04-05 | Pittsburg | SSE of of Pittsburg. Lake Francis Gate House @ Murphy Dam. (N45 02.821 W71 22.831) | |||||
| NH-05-01 | Grafton | Piermont | 1906 | 07-2002 | N44 00.613 W72 04.223 | N. of Piermont, Piermont Township. NH10 N. 2.9 miles from jct with NH25C in Piermont to the barn on the W. side of the road. Permission to tour the round barn at the Round Barn Gift Shop just across the road. Schmid, 16 sided barn, 16 sided windowed clerestory, octagon windowed cupola, very good condition. | |
| NH-06-01 | Hillsborough | Manchester | In Manchester. At 130 Mast Rd. Henry Lenz, octagon house, 2 story, red brick, front porch around 3 sides, windowed cupola. (N42 58.925 W71 29.208) | ||||
| NH-06-02 | Manchester | Octagon house, 2 story, white, no cupola. (N42 58.920 W71 29.242) | |||||
| NH-06-03 | Manchester | early 1870s | In Manchester. At 481 Hanover St. Octagon house, 2 story, red brick, porch on front side, 2 pitch roof w/small dormer on every other side, windowed cupola. (N42 59.444 W71 26.715) | ||||
| NH-06-04 | Manchester | In Manchester. Octagon bldg, 2 story, white, windowed cupola. Behind & attached to NH-06-03. (N42 59.434 W71 26.715) | |||||
| NH-06-05 | Manchester | c1855 | 06-2022 | N42 59.675 W71 27.320 | In Manchester. On the E. side of Beech St. ½ block S. of Bridge St. at 585. Octagon house, 2 story, red brick, flat roof, no cupola. | ||
| NH-06-06 | Manchester | 06-2018 | N42 59.302 W71 27.752 | In Veterans Memorial Park in Manchester. At the NE corner of Central St. & US3 (Elm St.) | |||
| NH-06-07 | Peterborough | 04-2021 | N42 56.023 W71 57.727 | N. of Peterborough, Peterborough Township. US202 N. 4.6 miles from jct with Main St. in Peterborough to the bldg on the W. side of the road. Gracie's Grain, round bldg. | |||
| NH-06-08 | Manchester | 06-2022 | N42 59.195 W71 27.703 | In Manchester. At the SE corner of Lake Av. & Elm St. SNHU Arena, oval bldg. | |||
| NH-07-01 | Merrimack | Concord | 88' | 1888 | 10-2020 | N43 11.777 W71 31.839 | In Concord. US3 NE 0.3 miles from jct with I93 exit 13 on the S. side of Concord, S. on NH3A (Main St.) 300' to the bldg on the E. side of the road. True round bldg, brick, conical roof, windowed cupola, excellent condition. Gasholder, was used to store gas for street lamps & homes. [www.SaveOurGasholder.org] |
| NH-07-?1 | Pittsfield | ??? | Almost in the center of town, but W. of the river. From 28 bypass, go E. into town on road that has PO, but stop just before this and go L into ? court to big house with large lawn, from NE corner of which there is best view of St. Laurent octagon barn, which is actually on the next parallel street. No cupola. (town=N43 18.355 W71 19.453) | ||||
| NH-07-?2 | Pittsfield | In Pittsfield. 16 sided house. (N43 18.155 W71 18.917) | |||||
| NH-08-01 | Rockingham | Portsmouth | 09-2022 | N43 01.695 W70 43.793 | At Walls Sands State Beach S. of Portsmouth, Rye Township. Sangamore Rd. (NH1A) S. (turns E. & becomes Pioneer Rd.) 2.65 miles from jct with US1 in Portsmouth, S. on Brackett (becomes Parsons) Rd. 1.05 miles, continue S. on Marsh Rd. 0.2 miles, right on Ocean Blvd 100 yds to the bldg on the SE side of the road. Ticket Booth, hexagon bldg. | ||
| NH-08-02 | Portsmouth | 1811 | 10-2023 | N43 03.848 W70 46.749 | In Portsmouth. At the S. corner of Exxex Av. & Islington St. Powder house, true round bldg, brick, conical roof, no cupola. Roof reshingled 2007. | ||
| NH-09-01 | Strafford | Milton | 11-2022 | N43 27.713 W70 59.496 | At New Hampshire Farm Museum N. of Milton, Milton Township. White Mountain Hwy N. 3.55 miles from jct with Silver St. on the N. side of Milton to the bldg on the W. side of the road. Octagon bldg, unpainted vertical siding, metal roof, windowed cupola. | ||
| NH-09-02 | Dover | Pre 1877 | 10-2024 | N43 12.032 W70 52.782 | In Dover. On the S. side of 5th St. ½ block W. of Grove St. at 53. Octagon house, 2 story, gray horizontal siding, flat roof. | ||
| NH-09-?2 | Dover | In Dover. 22 Broadway. Octagon turret. (N43 11.982 W70 52.387) | |||||
| NH-10-01 | Sullivan | Charlestown | 1850 | SE of Charlestown, Charlestown Township. Paris Av. E. 0.4 miles from jct with NH12 (Main St.) in Charlestown, S. Breakneck Hill Rd. (curves E. & becomes Hackett Swamp Rd., then Acworth Rd.) 2.3 miles, S. on Hemlock Rd. 2.1 miles to the house on the W. side of the road. Octagon house, 2 story, porch encircles 2nd floor, small dormer on every other side. (N43 12.773 W72 21.995) |