This is a list of the National Register of Historic Places listings in Floyd County, Iowa.

This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Floyd 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.^[1]

There are 20 properties and districts listed on the National Register in the county.

          This National Park Service list is complete through NPS recent listings posted April 5, 2024.^[2]

Current listings

[3]	Name on the Register[4]	Image	Date listed[5]	Location	City or town	Description
1	Brooks Round Barn	Upload image	June 30, 1986 (#86001429)	West of U.S. Route 218 42°57′00″N 92°35′04″W / 42.95°N 92.584444°W / 42.95; -92.584444 (Brooks Round Barn)	Nashua	No longer exists.
2	Central Park-North Main Street Historic District		August 10, 1976 (#76000771)	N. Main St. and N. Jackson St. 43°04′06″N 92°40′43″W / 43.068333°N 92.678611°W / 43.068333; -92.678611 (Central Park-North Main Street Historic District)	Charles City
3	Charles City Junior-Senior High School	Upload image	September 5, 2017 (#100001567)	500 N. Grand Ave. 43°04′05″N 92°40′20″W / 43.067933°N 92.672092°W / 43.067933; -92.672092 (Charles City Junior-Senior High School)	Charles City
4	Cook Farm	Upload image	June 18, 1979 (#79000895)	South of Charles City on U.S. Route 218 43°01′51″N 92°38′41″W / 43.030833°N 92.644722°W / 43.030833; -92.644722 (Cook Farm)	Charles City
5	A.B.C. Dodd House		May 22, 1978 (#78001220)	310 3rd Ave. 43°03′55″N 92°40′06″W / 43.065278°N 92.668333°W / 43.065278; -92.668333 (A.B.C. Dodd House)	Charles City
6	Dr. Salsbury's Laboratories, Main Office and Production Laboratory Building		March 7, 1996 (#96000235)	500 Gilbert St. 43°03′47″N 92°40′44″W / 43.063056°N 92.678889°W / 43.063056; -92.678889 (Dr. Salsbury's Laboratories, Main Office and Production Laboratory Building)	Charles City
7	Floyd County Court House	More images	August 28, 2003 (#03000816)	101 S. Main St. 43°03′56″N 92°40′54″W / 43.065556°N 92.681667°W / 43.065556; -92.681667 (Floyd County Court House)	Charles City
8	Charles Walter Hart House	More images	January 25, 1980 (#80001450)	800 3rd Ave. 43°03′55″N 92°39′38″W / 43.065278°N 92.660556°W / 43.065278; -92.660556 (Charles Walter Hart House)	Charles City
9	Hawkeye Street Underpass		June 25, 1998 (#98000777)	South Hawkeye St. under the railroad line 43°08′14″N 93°00′34″W / 43.137222°N 93.009306°W / 43.137222; -93.009306 (Hawkeye Street Underpass)	Nora Springs
10	Lucius and Maria Clinton Lane House		April 24, 1995 (#95000384)	2379 Timber Ave. 43°00′45″N 92°39′15″W / 43.0125°N 92.654167°W / 43.0125; -92.654167 (Lucius and Maria Clinton Lane House)	Charles City
11	Main Street Bridge		March 12, 1999 (#99000311)	Main St. over the Cedar River 43°03′58″N 92°40′48″W / 43.066111°N 92.68°W / 43.066111; -92.68 (Main Street Bridge)	Charles City
12	Marble Rock Bank	Upload image	November 10, 1982 (#82000407)	313 Bradford St. 42°57′55″N 92°52′04″W / 42.965278°N 92.867778°W / 42.965278; -92.867778 (Marble Rock Bank)	Marble Rock
13	Alvin Miller House	More images	November 16, 1978 (#78001221)	1107 Court St. 43°04′05″N 92°41′04″W / 43.068056°N 92.684444°W / 43.068056; -92.684444 (Alvin Miller House)	Charles City
14	Charles Henry Parr House		January 24, 1980 (#80001451)	100 W. Hulin St. 43°04′23″N 92°40′56″W / 43.073056°N 92.682222°W / 43.073056; -92.682222 (Charles Henry Parr House)	Charles City
15	River Street Bridge	Upload image	June 25, 1998 (#98000778)	River St. over a drainage ditch 42°58′00″N 92°52′10″W / 42.966667°N 92.869306°W / 42.966667; -92.869306 (River Street Bridge)	Marble Rock
16	Rockford Mill	Upload image	July 28, 1983 (#83000358)	Shell Rock River at 4th and Main St. 43°03′02″N 92°56′31″W / 43.050556°N 92.941944°W / 43.050556; -92.941944 (Rockford Mill)	Rockford
17	Sherman Nursery Company Historic District		November 12, 2014 (#14000905)	1300 Grove st. 43°03′54″N 92°41′21″W / 43.065°N 92.689167°W / 43.065; -92.689167 (Sherman Nursery Company Historic District)	Charles City
18	Spotts Round Barn	Upload image	June 30, 1986 (#86001430)	Iowa Highway 14 43°03′33″N 92°43′29″W / 43.059056°N 92.724694°W / 43.059056; -92.724694 (Spotts Round Barn)	Charles City
19	Tyden Farm No. 6 Farmstead Historic District	Upload image	June 11, 2009 (#09000401)	1145 300th St. 42°55′23″N 92°59′48″W / 42.923056°N 92.996667°W / 42.923056; -92.996667 (Tyden Farm No. 6 Farmstead Historic District)	Dougherty
20	Wildwood Park Historic District		September 25, 1998 (#98001205)	1 Wildwood Rd. 43°03′46″N 92°41′37″W / 43.062778°N 92.693611°W / 43.062778; -92.693611 (Wildwood Park Historic District)	Charles City

Former listings

One listing in Floyd county has been removed from the Register: