Owned by state government

18th Separate Company Armory (Warren County, New York)
7th District Police Station (Cook County, Illinois)
Absecon Lighthouse (Atlantic County, New Jersey)
Academy Hall (Erie County, Pennsylvania)
Adas Israel Synagogue (Washington, District of Columbia)
Administration Building (Union County, Oregon)
Agricultural Chemistry Building (Dane County, Wisconsin)
Member of the Henry Mall Historic District
Agricultural Engineering Building (Dane County, Wisconsin)
Member of the Henry Mall Historic District
Agriculture Building (Wake County, North Carolina)
Agriculture Hall (Dane County, Wisconsin)
Member of the Henry Mall Historic District
Alabama Insane Hospital (Tuscaloosa County, Alabama)
Alabama's oldest and largest inpatient psychiatric facility.
Alabama State Capitol (Montgomery County, Alabama)
Alamance Battleground State Historic Site (Alamance County, North Carolina)
Albert W. Thompson Hall (Whitman County, Washington)
Alcorn State University Historic District (Claiborne County, Mississippi)
Aliiolani Hale (Honolulu County, Hawaii)
Allen House (Alamance County, North Carolina)
Aloha Tower (Honolulu County, Hawaii)
Alston House (Moore County, North Carolina)
Ammons Hall (Larimer County, Colorado)
Ampere Station (Essex County, New Jersey)
AN/FPS-35 Radar Tower and Antenna (Suffolk County, New York)
Anaconda Copper Mining Company Smoke Stack (Deer Lodge County, Montana)
Anadarko Armory (Caddo County, Oklahoma)
Anderson House and Lexington Battlefield (Lafayette County, Missouri)
Anderson-Smith House (McCracken County, Kentucky)
Restored Civil War Era mansion now serving as a welcome center/rest area
Andrews-Duncan House (Wake County, North Carolina)
Appomattox (Shipwreck) (Milwaukee County, Wisconsin)
Largest wooden steam freighter on the Great Lakes that ran aground in 1905
Appomattox River Bridge (Appomattox County, Virginia)
AR 289 Bridge Over English Creek (Fulton County, Arkansas)
Arbor Lodge (Otoe County, Nebraska)
Arizona State Capitol Building (Maricopa County, Arizona)
Arkansas 7/51 Bridge (Clark County, Arkansas)
Through truss bridge over Ouachita River at Arkadelphia carrying AR 7, AR 8, and AR 51
Arkansas Highway 57 Bridge (Ouachita County, Arkansas)
Pony truss bridge over the railroad tracks on AR 57 in Stephens
Arkansas State Capitol (Pulaski County, Arkansas)
Armory of the Kentish Guards (Kent County, Rhode Island)
Armour's Warehouse (LaSalle County, Illinois)
Arrawanna Bridge (Middlesex County, Connecticut)
Ash Fork Maintenance Camp #1 (Yavapai County, Arizona)
Ashland Armory (Boyd County, Kentucky)
Ashland Bridge (New Castle County, Delaware)
Town lattice covered bridge over Red Clay Creek
Ashland Tuberculosis Hospital (Boyd County, Kentucky)
Assay Office (Ada County, Idaho)
Astor Fur Warehouse (Crawford County, Wisconsin)
Athens State Hospital (Athens County, Ohio)
Athens State Hospital Cow Barn (Athens County, Ohio)
Auburn Brick Road (Sangamon County, Illinois)
Aurora Avenue Bridge (King County, Washington)
AuSable Chasm Bridge (Clinton County, New York)
Steel arch bridge over AuSable River on US 9
Avery Point Lighthouse (New London County, Connecticut)
Babcock Building, South Carolina State Hospital (Richland County, South Carolina)
Bailey Hall (Douglas County, Kansas)
Bailey Hall houses several of the Liberal Arts College programs.
Barnard Observatory (Lafayette County, Mississippi)
Barnegat Lighthouse (Ocean County, New Jersey)
Barnwell-Gough House (Beaufort County, South Carolina)
Barrackville Covered Bridge (Marion County, West Virginia)
Burr arch-truss bridge over Finch's Run on CH 21
Bastrop State Park (Bastrop County, Texas)
Batsto Village (Burlington County, New Jersey)
Battery 223 (Cape May County, New Jersey)
Bayfield Fish Hatchery (Bayfield County, Wisconsin)
A Queen Anne style house that served as a fish hatchery for many years, now serving as a visitor center
Beech Fork Bridge, Mackville Road (Washington County, Kentucky)
Belle Meade (Davidson County, Tennessee)
Bellefonte Armory (Centre County, Pennsylvania)
Beloit Water Tower (Rock County, Wisconsin)
Ben Laney Bridge (Ouachita County, Arkansas)
Three-span pony truss bridge over Ouachita River on US 79B in Camden
Bennett Place State Historic Site (Durham County, North Carolina)
Bennington Battle Monument (Bennington County, Vermont)
Stone obelisk commemorating the Battle of Bennington in 1777.
Bentonville Battleground State Historic Site (Johnston County, North Carolina)
Berkeley Springs State Park (Morgan County, West Virginia)
Big Bone Lick State Park (Boone County, Kentucky)
Big Creek Bridge No. 01180 (Lane County, Oregon)
Birdwood (Albemarle County, Virginia)
Black River Bridge (Randolph County, Arkansas)
Through truss bridge with a center swing span over Black River on US 67 at Pocahontas
Blackledge River Railroad Bridge (New London County, Connecticut)
Blackwell Armory (Kay County, Oklahoma)
Blaine, James G., House (Kennebec County, Maine)
Blandwood (Guilford County, North Carolina)
Blossomland Bridge (Berrien County, Michigan)
Bascule bridge over St. Joseph River on M-63 in St. Joseph
Blue Hawk Peak Ranch (Pawnee County, Oklahoma)
Blue Pond (Bollinger County, Missouri)
Bodie Historic District (Mono County, California)
Bollinger Mill (Cape Girardeau County, Missouri)
Bonner House (Beaufort County, North Carolina)
Botanical and Horticultural Laboratory (Larimer County, Colorado)
Bourbon Iron Works (Bath County, Kentucky)
Bowling Green OMS #10 (Warren County, Kentucky)
Boxwood Hall (Union County, New Jersey)
BPRR - Mahoning Creek Bridge #2 (Armstrong County, Pennsylvania)
Deck truss bridge over Mahoning Creek on Buffalo & Pittsburgh Railroad
Bradford Armory (McKean County, Pennsylvania)
Branford House (New London County, Connecticut)
Breezedale (Indiana County, Pennsylvania)
Bridge in Dreher Township (Wayne County, Pennsylvania)
Bridge in French Creek Township (Mercer County, Pennsylvania)
Bridge in Greenwood Township (Clearfield County, Pennsylvania)
Through truss bridge over West Branch Susquehanna River on PA 3005
Bridge in Johnstown City (Cambria County, Pennsylvania)
Through truss bridge over Stonycreek River on PA 3022 in Johnstown
Bridge in Portage Township (Cambria County, Pennsylvania)
Bridge in Rockdale Township (Crawford County, Pennsylvania)
Through truss bridge over French Creek on PA 1016
Bridge in South Beaver Township (Beaver County, Pennsylvania)
Two-span pony truss bridge over Little Beaver Creek on Watts Mill Road
Bridge of Lions (St. Johns County, Florida)
Brunswick Town Historic District (Brunswick County, North Carolina)
Buckeye Furnace (Jackson County, Ohio)
Buckstaff Observatory (Winnebago County, Wisconsin)
A three dome, amateur observatory and weather observation station, dismantled in 2011.
Buena Vista (New Castle County, Delaware)
Buffalo State Asylum for the Insane (Erie County, New York)
Buffington Island (Meigs County, Ohio)
Bunker Hill Monument (Suffolk County, Massachusetts)
Bushy Run Battlefield (Westmoreland County, Pennsylvania)
Butler Armory (Butler County, Pennsylvania)
Cache River Bridge (Lawrence County, Arkansas)
Abandoned pony truss bridge over Cache River on US 412 between Walnut Ridge and Paragould
Caldwell Presbyterian Church Manse (Essex County, New Jersey)
Calhoun Depot (Gordon County, Georgia)
California State Capitol (Sacramento County, California)
Cama Beach Resort (Island County, Washington)
Camp George West Historic District (Jefferson County, Colorado)
Camp Hancock Site (Burleigh County, North Dakota)
Camp Randall (Dane County, Wisconsin)
Civil War Era US Army Camp now home of University of Wisconsin Badger Athletics
Camp Rhododendron (Monongalia County, West Virginia)
Historic buildings in Coopers Rock State Forest
Camp Washington-Carver Complex (Fayette County, West Virginia)
Campus Fire Station (Payne County, Oklahoma)
Cannon's Ferry (Sussex County, Delaware)
Cape Creek Bridge No. 01113 (Lane County, Oregon)
Cape Florida Lighthouse (Miami-Dade County, Florida)
Cape Henry Lighthouse (Virginia Beach, Virginia)
Cape Meares Lighthouse (Tillamook County, Oregon)
Capehart House (Wake County, North Carolina)
Capitol Building (Salt Lake County, Utah)
Capitol Complex Historic District (Kennebec County, Maine)
Capitol Park (Kennebec County, Maine)
Capt. Charles C. Henderson House (Clark County, Arkansas)
Captain Creek Bridge (Lincoln County, Oklahoma)
Pony truss bridge over Captain Creek on Business OK 66 in Wellston
CAPTAIN MERIWETHER LEWIS (dredge) (Nemaha County, Nebraska)
Carnifex Ferry State Park (Nicholas County, West Virginia)
Carr's Hill (Albemarle County, Virginia)
Carrington-Covert House (Travis County, Texas)
Carrolton Covered Bridge (Barbour County, West Virginia)
Cascade Theatre (Shasta County, California)
Cashier's House (Erie County, Pennsylvania)
Cass Scenic Railroad (Pocahontas County, West Virginia)
Cataract Covered Bridge (Owen County, Indiana)
Cathedral of Learning (Allegheny County, Pennsylvania)
535 feet tall 42 story skyscraper
Cave-In-Rock (Hardin County, Illinois)
Cedar Creek Grist Mill (Clark County, Washington)
Central Building, State Lunatic Asylum (Baldwin County, Georgia)
Central Ohio Lunatic Asylum (Franklin County, Ohio)
Central State Hospital Historic District (Dodge County, Wisconsin)
A maximum security correctional institution located in Waupun, Wisconsin
Chapin Mine Steam Pump Engine (Dickinson County, Michigan)
A steeple-compound condensing engine capable of lifting 200 tons of water a minute
Charles A. Lindbergh House and Park (Morrison County, Minnesota)
Charles Robinson House (Sheboygan County, Wisconsin)
Chatsworth Apartments (Wayne County, Michigan)
Cherokee Female Seminary (Cherokee County, Oklahoma)
Cherokee State Park (Marshall County, Kentucky)
Cherry Hall (Warren County, Kentucky)
Cherrytree Township Bridge (Venango County, Pennsylvania)
Chesapeake and Ohio 2755 Steam Locomotive (Logan County, West Virginia)
Chimney Point Tavern (Addison County, Vermont)
Chinook Point (Pacific County, Washington)
Christian Turck House (Waukesha County, Wisconsin)
1835 log home, built in Germantown, Washington County, Wisconsin and relocated to Old World Wisconsin, a museum of early Wisconsin structures.
City Waterway Bridge (Pierce County, Washington)
Vertical lift bridge over Foss Waterway on E. 11th Street in Tacoma
Clark Hall, University of Virginia (Albemarle County, Virginia)
Clark's Lookout, August 13, 1805 (Beaverhead County, Montana)
Clarkton Bridge (Charlotte County, Virginia)
Clear Creek State Park Family Cabin District (Jefferson County, Pennsylvania)
Clearfield Armory (Clearfield County, Pennsylvania)
Clemson College Sheep Barn (Pickens County, South Carolina)
Historic Agricultural Building on the campus of Clemson University
Clemson University Historic District I (Pickens County, South Carolina)
Historic college campus district in Clemson, SC
Clemson University Historic District II (Pickens County, South Carolina)
Historic college campus district in Clemson, SC
Clermont (Columbia County, New York)
Clinton Township Bridge (Venango County, Pennsylvania)
Clover Bottom Mansion (Davidson County, Tennessee)
Clover Lawn (McLean County, Illinois)
Colburn House State Historic Site (Kennebec County, Maine)
Cold Springs Pegram Truss Railroad Bridge (Blaine County, Idaho)
Pegram through truss bridge over Big Wood River on a pedestrian trail
College Street Bridge (Warren County, Kentucky)
Pratt through truss bridge over Barren River on College Street
Coloma (El Dorado County, California)
Colorado Governor's Mansion (Denver County, Colorado)
Colorado River Bridge (Mesa County, Colorado)
Two-span through truss over Colorado River on the I-70 Frontage Road (Old US 6)
Columbia Mills Building (Richland County, South Carolina)
Columbia River Bridge at Kettle Falls (Ferry County, Washington)
Through truss bridge over Columbia River on US 395
Columbia River Bridge at Northport (Stevens County, Washington)
Through truss bridge over Columbia River on WA 25 in Northport
Columbus-Belmont Civil War State Park (Hickman County, Kentucky)
Commandant's Residence Home (Waupaca County, Wisconsin)
Comstock Covered Bridge (Middlesex County, Connecticut)
One of three remaining covered bridges in Connecticut
Conant Creek Pegram Truss Railroad Bridge (Fremont County, Idaho)
Three-span Pegram through truss bridge over Conant Creek
Confederate Chapel, Cemetery and Cottage (Lafayette County, Missouri)
Confederate State Capitol (Hempstead County, Arkansas)
Connecticut State Capitol (Hartford County, Connecticut)
Connellsville Armory (Fayette County, Pennsylvania)
Connor Battlefield (Sheridan County, Wyoming)