National Register of Historic Places listings in Idaho

This is a directory of properties and districts included among the National Register of Historic Places listings in Idaho. There are approximately 1,000 sites in Idaho listed on the National Register. Each of the state's 44 counties has at least one listing on the National Register.

This National Park Service list is complete through NPS recent listings posted September 20, 2024.^[1]

Numbers of listings by county

The following are approximate tallies of current listings in Idaho on the National Register of Historic Places. These counts are based on entries in the National Register Information Database as of April 24, 2008^[2] and new weekly listings posted since then on the National Register of Historic Places web site.^[3] There are frequent additions to the listings and occasional delistings, and the counts here are not official. Also, the counts in this table exclude boundary increase and decrease listings which modify the area covered by an existing property or district and which carry a separate National Register reference number.

Experimental Breeder Reactor I in Butte County

Old Idaho State Penitentiary in Ada County

Gimlet Pegram Truss Railroad Bridge in Blaine County

	County	# of Sites
1	Ada	166
2	Adams	8
3	Bannock	30
4	Bear Lake	92
5	Benewah	9
6	Bingham	18
7	Blaine	23
8	Boise	4
9	Bonner	17
10	Bonneville	33
11	Boundary	9
12	Butte	4
13	Camas	1
14	Canyon	48
15	Caribou	8
16	Cassia	7
17	Clark	4
18	Clearwater	8
19	Custer	38
20	Elmore	24
21	Franklin	10
22	Fremont	14
23	Gem	10
24	Gooding	13
25	Idaho	43
26	Jefferson	6
27	Jerome	66
28	Kootenai	44
29	Latah	57
30	Lemhi	15
31	Lewis	4
32	Lincoln	41
33	Madison	3
34	Minidoka	3
35	Nez Perce	31
36	Oneida	8
37	Owyhee	14
38	Payette	15
39	Power	12
40	Shoshone	24
41	Teton	5
42	Twin Falls	42
43	Valley	26
44	Washington	30
(duplicates)		(12)^[a]
TOTAL		1,075