Here is a list of all Brown County properties and districts recognized by the Department of the Interior as being historically significant.
| County | Name | Address | City | Date Listed | NRIS | ||
| Brown | Aberdeen Commercial Historic District | 1-523 S. Main St. | Aberdeen | 05/23/1988 | #88000586 | ||
| Brown | Aberdeen Highlands Historic District | N. Main from 12th to 15th Ave. NE | Aberdeen | 06/05/1975 | #75001710 | ||
| Aberdeen Historic District | 3rd-6th Ave., Jay, Kline, and Arch Sts. | Aberdeen | 06/05/1975 | #75001711 | |||
| Augustana Swedish Lutheran Church | 4.5 mi. S of Claremont | Claremont | 12/20/1988 | #88002842 | |||
| Brown | Aurland United Norwegian Lutheran Church | SE of Frederick | Frederick | 04/16/1982 | #82003916 | ||
| Brown | Bickelhaupt, William G., House | 1003 S. Jay | Aberdeen | 10/19/1989 | #89001727 | ||
| Brown | Brown County Courthouse | 1st Ave. | Aberdeen | 06/03/1976 | #76001718 | ||
| Brown | Brown Hall | Main St. | Barnard | 02/07/1990 | #89002336 | ||
| Brown | Campbell, Colin, Post | Restricted | Frederick | 05/27/1988 | #88000584 | ||
| Brown | Chicago, Milwaukee, St. Paul and Pacific Railroad Depot | Main St. and Railroad Ave. | Aberdeen | 09/20/1977 | #77001238 | ||
| Brown | Dakota Farmer Building | 1216 S. Main St. | Aberdeen | 08/01/1984 | #84003221 | ||
| Brown | Easton’s Castle | 1210 2nd Ave. NW | Aberdeen | 03/01/1973 | #73001736 | ||
| Brown | Finnish Apostolic Lutheran Church | Restricted | Frederick | 03/31/1984 | #84003223 | ||
| Brown | Firey, John H., House | 418 S. Arch St. | Aberdeen | 03/23/1995 | #95000277 | ||
| Brown | First United Methodist Church | S. Lincoln St. and SE 5th Ave. | Aberdeen | 05/28/1976 | #76001719 | ||
| Brown | Foght-Murdy House | 1403 S. Main St. | Aberdeen | 03/23/1995 | #95000276 | ||
| Brown | Geranen, Paul and Fredriika, Farm | E of Frederick | Frederick | 11/13/1985 | #85003498 | ||
| Brown | Great Northern Railway Passenger and Freight Depot | 1 Court St. | Aberdeen | 01/27/1983 | #83003002 | ||
| Brown | Herron, Anna, Farm | 1.5 mi. E of SD 18 on Co. Hwy 21, West Hanson Township | Groton | 06/30/1995 | #95000778 | ||
| Brown | Karl, Art, Farm | Junction of SD 21 and SD 14, SE corner, West Gem Township | Aberdeen | 07/07/1995 | #95000777 | ||
| Brown | Lamont, Margaret and Maurice, House | 515 S. Arch St. | Aberdeen | 03/23/1995 | #95000281 | ||
| Brown | Martilla-Pettingel and Gorder General Merchandise Store | 515-516 Main St. | Frederick | 11/13/1985 | #85003490 | ||
| Brown | Masonic Temple | 503 S. Main St. | Aberdeen | 05/29/1980 | #80003719 | ||
| Brown | McGregor House | 621 S. Kline St. | Aberdeen | 06/08/2005 | #05000591 | ||
| Brown | McKenzie-Cassels House | 508 N. Third St. | Groton | 02/13/1986 | #86000242 | ||
| Brown | Minneapolis and St. Louis Railroad Depot | 1100 S. Main St. | Aberdeen | 09/28/1976 | #76001720 | ||
| Brown | Modern Woodmen of America Hall | Junction of Main & Second Sts., NW corner | Mansfield | 07/07/1995 | #95000775 | ||
| Brown | Pfutzenreuter, George, House | 411 Third St. | Hecla | 06/21/1990 | #90000955 | ||
| Brown | Plana School | 7 mi. N of SD 12 and 1 mi. E of SD 16 | Plana | 07/07/1995 | #95000773 | ||
| Brown | U.S. Post Office and Courthouse | 102 4th Ave. SE | Aberdeen | 10/04/2006 | #06000931 | ||
| Brown | Ryman, Melchoir, Farm | 2 mi. W of SD 281, 3 mi. N of Mansfield | Mansfield | 06/30/1995 | #95000771 | ||
| Brown | Savo Hann-Finnish National Society Hall | NE of Savo | Savo Township | 11/13/1985 | #85003494 | ||
| Brown | SDDOT Bridge No. 07-009-060 | Local road over Elm Dam Spillway | Frederick vicinity | 03/09/2000 | #00000185 | ||
| Brown | SDDOT Bridge No. 07-220-454 | Local road over Mud Creek | Stratford vicinity | 03/09/2000 | #00000184 | ||
| Brown | SDDOT Bridge No. 07-268-030 | Local road over James River | Hecla vicinity | 03/09/2000 | #00000186 | ||
| Brown | SDDOT Bridge No. 07-304-414 | Local road over Ferney Ravine | Ferney vicinity | 03/09/2000 | #00000187 | ||
| Brown | Simmons House | 1408 S. Main St. | Aberdeen | 08/01/1984 | #84003224 | ||
| Brown | Trinity Episcopal Church | 3rd Ave. E. and 3rd St. N. | Groton | 01/27/1983 | #83003003 | ||
| Brown | Ward, Alonzo, Hotel | 104 S. Main St. | Aberdeen | 06/17/1982 | #82003915 | ||
| Brown | Welsh Presbyterian Church | 7 mi. N of SD 12 and 1 mi. E of SD 16 | Plana | 07/06/1995 | #95000776 | ||
| Brown | Werth, Gustav and Mary, House | 1502 N. Dakota St. | Aberdeen | 06/28/1991 | #91000846 | ||
| Brown | Western Union Building | 21-23 S. Main St. | Aberdeen | 12/12/1976 | #76001721 | ||
| Brown | Wylie Park Pavilion | N. of Aberdeen off US 281 | Aberdeen | 01/26/1978 | #78002540 |
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