National Register of Historic Places listings in Plymouth County, Iowa
# National Register of Historic Places listings in Plymouth County, Iowa

This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Plymouth County, Iowa, United States. Latitude and longitude coordinates are provided for many National Register properties and districts; these locations may be seen together in a map.

There are 11 properties and districts listed on the National Register in the county, including 1 National Historic Landmark.

This National Park Service list is complete through NPS recent listings posted July 14, 2023.

| | Name on the Register | Image | Date listed | Location | City or town | Description |
| - | - | - | - | - | - | - |
| 1 | Akron Opera House | Akron Opera House | July 10, 2012 (#12000403) | 151 Reed St. 42°49′44″N 96°33′36″W﻿ / ﻿42.828750°N 96.560000°W﻿ / 42.828750; -96.560000﻿ (Akron Opera House) | Akron | |
| 2 | Foster Park Historic District | Upload image | April 25, 2008 (#08000329) | 500-900 blocks of Central Ave., S. and blocks around Foster Park 42°47′01″N 96°09′59″W﻿ / ﻿42.783611°N 96.166278°W﻿ / 42.783611; -96.166278﻿ (Foster Park Historic District) | Le Mars | |
| 3 | Kimball Village | Kimball Village | June 11, 2010 (#10000343) | Address Restricted | Westfield | Designated a National Historic Landmark on January 11, 2017 |
| 4 | Le Mars Central High School | Le Mars Central High School | May 14, 1999 (#99000492) | 335 1st Ave., SW. 42°47′19″N 96°10′05″W﻿ / ﻿42.788611°N 96.168056°W﻿ / 42.788611; -96.168056﻿ (Le Mars Central High School) | Le Mars | |
| 5 | Le Mars Downtown Commercial Historic District | Le Mars Downtown Commercial Historic District More images | November 6, 2012 (#12000908) | Bounded by 2nd St., N., 2nd Ave., W., 1st St., S., and 1st Ave., E. 42°47′37″N 96°10′02″W﻿ / ﻿42.793611°N 96.167222°W﻿ / 42.793611; -96.167222﻿ (Le Mars Downtown Commercial Historic District) | Le Mars | |
| 6 | Le Mars Municipal Park and Golf Course Historic District | Le Mars Municipal Park and Golf Course Historic District More images | August 8, 2001 (#01000858) | Between 4th Ave., NE. and Iowa Highway 3 42°48′10″N 96°09′03″W﻿ / ﻿42.802778°N 96.150833°W﻿ / 42.802778; -96.150833﻿ (Le Mars Municipal Park and Golf Course Historic District) | Le Mars | |
| 7 | Le Mars Public Library | Le Mars Public Library | March 26, 1979 (#79000922) | 200 Central 42°47′25″N 96°09′56″W﻿ / ﻿42.790278°N 96.165556°W﻿ / 42.790278; -96.165556﻿ (Le Mars Public Library) | Le Mars | |
| 8 | Plymouth County Courthouse | Plymouth County Courthouse More images | July 2, 1981 (#81000263) | E. 3rd Ave. 42°47′23″N 96°09′40″W﻿ / ﻿42.789722°N 96.161111°W﻿ / 42.789722; -96.161111﻿ (Plymouth County Courthouse) | Le Mars | |
| 9 | Sacred Heart Hospital | Sacred Heart Hospital | February 3, 2010 (#09001303) | 4110 6th Ave., NE. 42°47′41″N 96°09′27″W﻿ / ﻿42.794722°N 96.157500°W﻿ / 42.794722; -96.157500﻿ (Sacred Heart Hospital) | Le Mars | |
| 10 | St. George's Episcopal Church | Upload image | November 21, 1976 (#76000797) | 400 1st Ave., SE. 42°47′16″N 96°09′52″W﻿ / ﻿42.787778°N 96.164444°W﻿ / 42.787778; -96.164444﻿ (St. George's Episcopal Church) | Le Mars | |
| 11 | Tonsfeldt Round Barn | Tonsfeldt Round Barn More images | November 19, 1986 (#86003194) | Plymouth County Fairgrounds 42°47′52″N 96°09′34″W﻿ / ﻿42.797778°N 96.159444°W﻿ / 42.797778; -96.159444﻿ (Tonsfeldt Round Barn) | Le Mars | |

## Former listing

| | Name on the Register | Image | Date listed | Date removed | Location | City or town | Description |
| - | - | - | - | - | - | - | - |
| 1 | Thoren Hall | Thoren Hall | May 22, 1978 (#78001248) | May 22, 1998 | Westmar College campus, 10th St. | Le Mars | Demolished November 11, 1990 |
| 2 | Reeves Farmstead Historic District | Reeves Farmstead Historic District | January 26, 2001 (#00001680) | December 2, 2020 | Lake St. 42°48′49″N 96°11′37″W﻿ / ﻿42.813611°N 96.193611°W﻿ / 42.813611; -96.193611﻿ (Reeves Farmstead Historic District) | Le Mars | |
