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

This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Mahaska 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 48 properties and districts listed on the National Register in the county.

          This National Park Service list is complete through NPS recent listings posted April 26, 2024.^[2]

Current listings

[3]	Name on the Register[4]	Image	Date listed[5]	Location	City or town	Description
1	Carroll Alsop House		November 9, 1988 (#88002142)	1907 A Ave., E. 41°17′49″N 92°37′21″W / 41.296944°N 92.6225°W / 41.296944; -92.6225 (Carroll Alsop House)	Oskaloosa
2	Bellefountain Bridge		May 15, 1998 (#98000506)	Ashland Ave. over the Des Moines River 41°19′58″N 92°51′56″W / 41.332778°N 92.865556°W / 41.332778; -92.865556 (Bellefountain Bridge)	Tracy
3	Dr. William E. and Ethel Rosenberger Berry House		March 29, 1996 (#96000343)	116 Rosenberger Ave. 41°18′22″N 92°38′46″W / 41.306111°N 92.646111°W / 41.306111; -92.646111 (Dr. William E. and Ethel Rosenberger Berry House)	Oskaloosa
4	Thomas J. Conover House		March 28, 1996 (#96000342)	1010 N. Market St. 41°18′14″N 92°38′39″W / 41.303889°N 92.644167°W / 41.303889; -92.644167 (Thomas J. Conover House)	Oskaloosa
5	Edmundson Park Historic District		September 27, 2007 (#07001005)	Junction of 11th Ave., W. and Edmundson Dr. 41°17′07″N 92°39′36″W / 41.28524°N 92.65991°W / 41.28524; -92.65991 (Edmundson Park Historic District)	Oskaloosa
6	Eveland Bridge	More images	May 15, 1998 (#98000504)	Fulton Ave. over the Des Moines River 41°14′34″N 92°45′24″W / 41.242708°N 92.756528°W / 41.242708; -92.756528 (Eveland Bridge)	Oskaloosa
7	Forest Cemetery Entrance		December 13, 1991 (#91001765)	Junction of N. 9th St. and J Ave., E. 41°18′12″N 92°38′02″W / 41.303333°N 92.633889°W / 41.303333; -92.633889 (Forest Cemetery Entrance)	Oskaloosa
8	E.H. Gibbs House	Upload image	December 13, 1991 (#91001761)	William Penn University campus, N. Market Extension 41°18′31″N 92°38′41″W / 41.308611°N 92.644722°W / 41.308611; -92.644722 (E.H. Gibbs House)	Oskaloosa
9	Ulysses Simpson Grant Elementary School		December 10, 2008 (#08001163)	715 B Ave., E. 41°17′50″N 92°38′16″W / 41.29716°N 92.6378°W / 41.29716; -92.6378 (Ulysses Simpson Grant Elementary School)	Oskaloosa
10	Phil Hoffman House		December 13, 1991 (#91001760)	807 High Ave., E. 41°17′44″N 92°38′09″W / 41.295556°N 92.635833°W / 41.295556; -92.635833 (Phil Hoffman House)	Oskaloosa
11	Iowa Yearly Meeting House-College Avenue Friends Church		March 29, 1996 (#96000344)	912 N. C St. 41°18′12″N 92°38′53″W / 41.303333°N 92.648056°W / 41.303333; -92.648056 (Iowa Yearly Meeting House-College Avenue Friends Church)	Oskaloosa
12	William A. and Ida C. Johnson House		March 28, 1996 (#96000346)	307 College Ave. 41°18′14″N 92°38′50″W / 41.303889°N 92.647222°W / 41.303889; -92.647222 (William A. and Ida C. Johnson House)	Oskaloosa
13	Dr. William H. and Mae R. Klose House		March 29, 1996 (#96000350)	1002 Penn Boulevard 41°18′23″N 92°38′51″W / 41.306389°N 92.6475°W / 41.306389; -92.6475 (Dr. William H. and Mae R. Klose House)	Oskaloosa
14	Lake Keomah State Park, Bathhouse-Lodge Area (Area A)	Upload image	November 15, 1990 (#90001666)	Off Iowa Highway 371 south of its junction with Iowa Highway 92 41°17′26″N 92°32′27″W / 41.290556°N 92.540833°W / 41.290556; -92.540833 (Lake Keomah State Park, Bathhouse-Lodge Area (Area A))	Oskaloosa
15	Lake Keomah State Park, Erosion Control Area (Area B)	Upload image	November 15, 1990 (#90001667)	Off Iowa Highway 371 south of its junction with Iowa Highway 92 41°17′07″N 92°32′32″W / 41.285278°N 92.542222°W / 41.285278; -92.542222 (Lake Keomah State Park, Erosion Control Area (Area B))	Oskaloosa
16	Jack Lamberson House		November 9, 1988 (#88002146)	511 N. Park Ave. 41°18′01″N 92°37′37″W / 41.300278°N 92.626944°W / 41.300278; -92.626944 (Jack Lamberson House)	Oskaloosa
17	Lincoln School		December 13, 1991 (#91001766)	911 B Ave., W. 41°17′51″N 92°39′17″W / 41.2975°N 92.654722°W / 41.2975; -92.654722 (Lincoln School)	Oskaloosa
18	Mahaska County Courthouse	More images	July 2, 1981 (#81000255)	Market St. and 2nd Ave. 41°17′42″N 92°38′35″W / 41.295°N 92.643056°W / 41.295; -92.643056 (Mahaska County Courthouse)	Oskaloosa
19	Maj. James W. McMullin House		April 11, 1985 (#85000723)	403 1st Ave., E. 41°17′40″N 92°38′26″W / 41.294444°N 92.640556°W / 41.294444; -92.640556 (Maj. James W. McMullin House)	Oskaloosa
20	W.A. McNeill House		October 21, 1999 (#99001267)	1282 C Ave., E. 41°17′54″N 92°37′36″W / 41.298333°N 92.626667°W / 41.298333; -92.626667 (W.A. McNeill House)	Oskaloosa
21	Daniel Nelson House and Barn	More images	November 20, 1974 (#74000798)	2211 Nelson Lane 41°19′14″N 92°37′50″W / 41.320556°N 92.630556°W / 41.320556; -92.630556 (Daniel Nelson House and Barn)	Oskaloosa
22	North Skunk River Bridge	Upload image	May 15, 1998 (#98000503)	County Road G13 over the North Skunk River 41°29′41″N 92°38′00″W / 41.494722°N 92.633333°W / 41.494722; -92.633333 (North Skunk River Bridge)	New Sharon
23	Oskaloosa City Hall		December 13, 1991 (#91001764)	Northeastern corner of the junction of S. Market St. and 2nd Ave., E. 41°17′37″N 92°38′40″W / 41.293611°N 92.644444°W / 41.293611; -92.644444 (Oskaloosa City Hall)	Oskaloosa
24	Oskaloosa City Park and Band Stand	More images	July 28, 1983 (#83000389)	City Park 41°17′42″N 92°38′38″W / 41.295°N 92.643889°W / 41.295; -92.643889 (Oskaloosa City Park and Band Stand)	Oskaloosa
25	Oskaloosa City Square Commercial Historic District	More images	April 10, 1986 (#86000716)	Roughly bounded by A Ave., E, N. and S. 2nd St., 2nd Ave., E, and N. and S. A St. 41°17′48″N 92°38′39″W / 41.296667°N 92.644167°W / 41.296667; -92.644167 (Oskaloosa City Square Commercial Historic District)	Oskaloosa
26	Oskaloosa Fire Station		December 13, 1991 (#91001763)	109-111 2nd Ave., E. 41°17′37″N 92°38′39″W / 41.293611°N 92.644167°W / 41.293611; -92.644167 (Oskaloosa Fire Station)	Oskaloosa
27	Oskaloosa Monthly Meeting of Friends Parsonage		March 29, 1996 (#96000348)	910 N. C St. 41°18′10″N 92°38′53″W / 41.302778°N 92.648056°W / 41.302778; -92.648056 (Oskaloosa Monthly Meeting of Friends Parsonage)	Oskaloosa
28	Oskaloosa Post Office	Upload image	February 6, 2020 (#100004975)	206 North Market St. 41°17′47″N 92°38′42″W / 41.296473°N 92.644885°W / 41.296473; -92.644885 (Oskaloosa Post Office)	Oskaloosa
29	Oskaloosa Public Library	More images	December 13, 1991 (#83004763)	Southwestern corner of the junction of Market St. and 2nd Ave. 41°17′35″N 92°38′42″W / 41.293056°N 92.645°W / 41.293056; -92.645 (Oskaloosa Public Library)	Oskaloosa
30	Paradise Block Historic District	More images	December 13, 1991 (#91001767)	402, 406, 408, 410, 414, 418, and 510-714 High Ave. E. 41°17′43″N 92°38′18″W / 41.295278°N 92.638333°W / 41.295278; -92.638333 (Paradise Block Historic District)	Oskaloosa
31	Penn College Historic District	More images	April 4, 1996 (#96000391)	201 Trueblood Ave. 41°18′32″N 92°38′47″W / 41.308889°N 92.646389°W / 41.308889; -92.646389 (Penn College Historic District)	Oskaloosa
32	Pierson-Betts House		March 28, 1996 (#96000347)	815 Penn Boulevard 41°18′22″N 92°38′52″W / 41.306111°N 92.647778°W / 41.306111; -92.647778 (Pierson-Betts House)	Oskaloosa
33	President's Cottage		March 28, 1996 (#96000340)	425 College Ave. 41°18′13″N 92°39′00″W / 41.303611°N 92.65°W / 41.303611; -92.65 (President's Cottage)	Oskaloosa
34	Rock Island Passenger Depot		October 30, 1989 (#89001780)	Rock Island Ave. between 1st and 2nd Sts. 41°17′21″N 92°38′34″W / 41.289167°N 92.642778°W / 41.289167; -92.642778 (Rock Island Passenger Depot)	Oskaloosa
35	Rose Hill Methodist Episcopal Church		April 11, 2003 (#03000201)	304 Main St. 41°19′14″N 92°27′55″W / 41.320556°N 92.465278°W / 41.320556; -92.465278 (Rose Hill Methodist Episcopal Church)	Rose Hill
36	St. James Episcopal Church		December 13, 1991 (#91001762)	Southwestern corner of the junction of 1st Ave. and S. 3rd St. 41°17′39″N 92°38′29″W / 41.294167°N 92.641389°W / 41.294167; -92.641389 (St. James Episcopal Church)	Oskaloosa
37	Seeberger-Loring-Kilburn House		July 14, 1983 (#83000390)	509 High Ave., E. 41°17′44″N 92°38′22″W / 41.295556°N 92.639444°W / 41.295556; -92.639444 (Seeberger-Loring-Kilburn House)	Oskaloosa
38	John H. Shoemake House		March 22, 1984 (#84001276)	116 2nd Ave., W. 41°17′36″N 92°38′44″W / 41.293333°N 92.645556°W / 41.293333; -92.645556 (John H. Shoemake House)	Oskaloosa
39	Smith-Johnson House		November 9, 1977 (#77000538)	713 High Ave., E. 41°17′44″N 92°38′13″W / 41.295556°N 92.636944°W / 41.295556; -92.636944 (Smith-Johnson House)	Oskaloosa
40	Spring Creek Friends Cemetery	Upload image	March 29, 1996 (#96000351)	Junction of Osburn Ave. and 235th St. 41°18′41″N 92°36′09″W / 41.311389°N 92.6025°W / 41.311389; -92.6025 (Spring Creek Friends Cemetery)	Oskaloosa
41	Spring Creek Meeting House-H Street Mission	Upload image	March 28, 1996 (#96000339)	207 N. H St. 41°17′47″N 92°39′17″W / 41.296389°N 92.654722°W / 41.296389; -92.654722 (Spring Creek Meeting House-H Street Mission)	Oskaloosa
42	Spurgin Residence		March 28, 1996 (#96000341)	313 College Ave. 41°18′14″N 92°39′00″W / 41.303889°N 92.65°W / 41.303889; -92.65 (Spurgin Residence)	Oskaloosa
43	Stock Judging Pavilion		April 12, 1984 (#84001280)	Southern Iowa Fairgrounds 41°18′04″N 92°39′43″W / 41.301111°N 92.661944°W / 41.301111; -92.661944 (Stock Judging Pavilion)	Oskaloosa
44	Dr. Ella Stokes House		March 29, 1996 (#96000349)	416 W. College Hill Ave. 41°18′21″N 92°38′59″W / 41.305833°N 92.649722°W / 41.305833; -92.649722 (Dr. Ella Stokes House)	Oskaloosa
45	Prof. Edgar H. and Irene D. Stranahan House		March 28, 1996 (#96000345)	1001 Gurney St. 41°18′23″N 92°38′49″W / 41.306389°N 92.646944°W / 41.306389; -92.646944 (Prof. Edgar H. and Irene D. Stranahan House)	Oskaloosa
46	Vander Wilt Farmstead Historic District		January 8, 2004 (#03001370)	1345 Iowa Highway 163, Sec. 22, T26N, R17W, SW of NE 41°22′22″N 92°48′11″W / 41.372778°N 92.803056°W / 41.372778; -92.803056 (Vander Wilt Farmstead Historic District)	Leighton
47	Gary J. and Matilda Vermeer Farmstead	Upload image	July 23, 2018 (#100002682)	1688 250th Ave. 41°24′35″N 92°52′16″W / 41.4097°N 92.8710°W / 41.4097; -92.8710 (Gary J. and Matilda Vermeer Farmstead)	Pella
48	John K. Voorhees House		March 5, 1982 (#82002632)	Northwest of Oskaloosa on Iowa Highway 163 41°23′09″N 92°49′22″W / 41.385833°N 92.822778°W / 41.385833; -92.822778 (John K. Voorhees House)	Oskaloosa

Former listings

One property was formerly listed but has been removed: