– Aug 7, 2006
| Number | County | Town | Size | Built | Verif | GPS | Description |
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| MD-01-01 | Allegany | La Vale | 14 | 1836 | 05-2002 | approximate N39 38.19 W78 50.62 | SW of La Vale. US40 S. (curves W.) 2.6 miles from jct with Cash Valley Rd. in La Vale to the building. Lavale Toll House, 7 sided, 2 story, brick painted white, conical roof, small closed cupola, excellent condition. Restored 1998. [www.wamonline.com/fall2000/tollgate.htm] |
| MD-03-01 | Baltimore | Baltimore | ? | Railroad roundhouse. The B&O Railroad has converted a large roundhouse into an interesting railroad museum. | |||
| MD-03-02 | Baltimore | ? | Round church no location available. Greek Orthodox. | ||||
| MD-03-03 | Baltimore | ? | Octagon house on MD1. No other location available. Scott residence. | ||||
| MD-03-04 | Worthington | ? | Octagon house in town, no location available. | ||||
| MD-03-05 | Lutherville | ? | Octagon house in town, no location available. | ||||
| MD-03-06 | Lutherville | ? | Octagon house in town, no location available. | ||||
| MD-03-07 | Trentham | ? | Octagon house near Reistertown Ln. (No such town - DJT) | ||||
| MD-03-08 | Mt. Washington | ? | Octagon building at St. Agnes College. Built before the Civil War. (Internet check implies this might be gone - DJT) | ||||
| MD-07-01 | Cecil | North East | 07-2006 | N39 27.65 W76 00.28 | S. of North East, District 5 North East Township. MD 272 (Main St. - becomes Turkey Point Rd.) S. 11.5 miles from jct with MD7 (Cecil Av.) in North East to the house on the W. side of the road. 16-sided house, light blue horizontal siding, no cupola. | ||
| MD-10-01 | Frederick | Frederick | 10-2005 | N39 27.31 W77 20.57 | NE of Frederick, Mount Pleasant Township. MD26 E. 3.1 miles from jct with MD355 in Frederick to the barn on the N. side of the road up a driveway 0.2 miles. Glade Valley Farm, octagon barn, concrete walls, tall louvered cupola with weather vane, sectional conical roof, excellent condition. | ||
| MD-10-02 | Point of Rocks | ? | Octagonal post office building. | ||||
| MD-11-01 | Garrett | Friendsville | 05-2000 | approximate N39 40.63 W79 22.56 | At the eastbound I68 rest area NE of Friendsville. I68 NE about 2.5 miles from jct with MD42 (I68 exit 4) in Friendsville to the rest area. Information bldg, 16 sided, tan vertical siding, 2 story. | ||
| MD-11-02 | Friendsville | 05-2000 | approximate N39 40.64 W79 22.50 | Next to MD-11-01. Canteen bldg, octagon, cut limestone. | |||
| MD-11-03 | Friendsville | 05-2000 | approximate N39 40.65 W79 22.44 | Next to MD-11-02. Rest room bldg, octagon, cut limestone, louvered cupola. | |||
| MD-12-01 | Harford | Darlington | ? | On Hartford Rd. (???) Is this the same as the octagon chapel in Chapel Cemetery? | |||
| MD-15-01 | Montgomery | Olney | 28' | 1997 | 10-2005 | N39 08.97 W77 01.29 | In Olney. MD108 SE 1.4 miles from jct with MD97 in Olney, E. on MD108 1.3 miles to the bldg on the N. side of the road. Sandy Spring Museum, octagon bldg, brick, windowed cupola [www.sandyspringmuseum.org] |
| MD-16-01 | Prince George's | Cedar Heights | ? | Round house no location available. (Can't find Cedar Heights in Prince George's County - DJT) | |||
| MD-16-02 | Bowie | 1972 | 10-2005 | N39 00.52 W76 45.85 | E. of Bowie. On the W. side of the jct of MD197 & MD564 on the E. side of Bowie at 8655 Normal School Rd. Geodesic house build from a kit from California. | ||
| MD-20-01 | Talbot | Easton | ca 1881 | 06-1998 | very approximate N38 44.0 W76 04.1 | S. of Easton. MD50 S. from Easton to the church on the E. side of the road. Hexagon church, white horizontal siding, conical roof, no cupola, excellent condition. | |
| MD-20-02 | St. Michaels | 1880 | At the Chesapeake Bay Maritime Museum in St. Michaels. Mill St. E. 0.25 miles (to the end) from jct with MD33 in St. Michaels. Hooper Strait Lighthouse, octagon bldg. [N38 47.25 W76 13.16] |