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

This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Monona 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 one National Historic Landmark.
This National Park Service list is complete through NPS recent listings posted February 28, 2025.
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* GPX (secondary coordinates)
| | Name on the Register | Image | Date listed | Location | City or town |
| 1 | Garretson Outlet Bridge | Upload image | March 12, 1999 (#99000313) | County Road K64 over Garretson Outlet Ditch 42°12′47″N 96°06′42″W﻿ / ﻿42.213056°N 96.111667°W﻿ / 42.213056; -96.111667﻿ (Garretson Outlet Bridge) | Whiting vicinity |
| 2 | Ingemann Danish Evangelical Lutheran Church and Cemetery | Ingemann Danish Evangelical Lutheran Church and Cemetery More images | September 10, 2012 (#12000779) | 32044 County Road E54 41°56′19″N 95°55′37″W﻿ / ﻿41.938536°N 95.926808°W﻿ / 41.938536; -95.926808﻿ (Ingemann Danish Evangelical Lutheran Church and Cemetery) | Moorhead |
| 3 | Jones Creek Watershed Historic District | Upload image | December 23, 1991 (#91001839) | Between the Little Sioux and Soldier Rivers, southwest of Moorhead 41°54′28″N 95°55′30″W﻿ / ﻿41.907778°N 95.925000°W﻿ / 41.907778; -95.925000﻿ (Jones Creek Watershed Historic District) | Moorhead |
| 4 | Mann School No. 2 | Mann School No. 2 | January 16, 2001 (#00001655) | Oak Ave, 3.5 miles northwest of the entrance to Preparation Canyon State Park 41°55′48″N 95°57′12″W﻿ / ﻿41.929917°N 95.953333°W﻿ / 41.929917; -95.953333﻿ (Mann School No. 2) | Moorhead |
| 5 | Monona County Courthouse | Monona County Courthouse More images | July 2, 1981 (#81000257) | Iowa Ave. 42°01′37″N 96°05′33″W﻿ / ﻿42.027083°N 96.092389°W﻿ / 42.027083; -96.092389﻿ (Monona County Courthouse) | Onawa |
| 6 | Onawa IOOF Opera House | Onawa IOOF Opera House More images | August 3, 1990 (#90001194) | 1023 10th Ave. 42°01′32″N 96°05′49″W﻿ / ﻿42.025611°N 96.096861°W﻿ / 42.025611; -96.096861﻿ (Onawa IOOF Opera House) | Onawa |
| 7 | Onawa Public Library | Onawa Public Library | October 1, 1979 (#79000917) | Iowa Ave. and 7th St. 42°01′35″N 96°05′36″W﻿ / ﻿42.026315°N 96.093460°W﻿ / 42.026315; -96.093460﻿ (Onawa Public Library) | Onawa |
| 8 | Round Barn, Cooper Township | Upload image | June 30, 1986 (#86001463) | Iowa Highway 141 42°07′45″N 95°43′42″W﻿ / ﻿42.129278°N 95.728417°W﻿ / 42.129278; -95.728417﻿ (Round Barn, Cooper Township) | Mapleton vicinity |
| 9 | South Jordan Cemetery | South Jordan Cemetery | March 5, 2021 (#100006221) | 33928 260th St. 42°58′46″N 95°53′09″W﻿ / ﻿42.979508°N 95.885759°W﻿ / 42.979508; -95.885759﻿ (South Jordan Cemetery) | Moorhead vicinity |
| 10 | Trinity Memorial Episcopal Church | Trinity Memorial Episcopal Church More images | August 10, 1990 (#90001217) | 302 S. 7th St. 42°09′48″N 95°47′19″W﻿ / ﻿42.16325°N 95.7885°W﻿ / 42.16325; -95.7885﻿ (Trinity Memorial Episcopal Church) | Mapleton |
| 11 | Newell A. Whiting House | Newell A. Whiting House | August 10, 1990 (#90001216) | 1106 Iowa Ave. 42°01′37″N 96°05′57″W﻿ / ﻿42.027068°N 96.099037°W﻿ / 42.027068; -96.099037﻿ (Newell A. Whiting House) | Onawa |