Indiana - Criteria: C (architecture/engineering)
| Abbott-Holloway Farm |
| Abel, Elias, House |
| Abercrombie, John H. and Mary, House |
| Adams County Courthouse |
| Adams Mill |
| Adams Mill Covered Bridge |
| Ade, George, House |
| Administration Building, Indiana Central University |
| Ahavas Shalom Reform Temple |
| Aikens, David, House |
| Alameda |
| Albion Courthouse Square Historic District |
| Albion Flats |
| Alexandra |
| Alhambra Theatorium |
| All American Bank Building |
| Allen County Courthouse |
| Allen, Lemuel, Farm |
| Allison Mansion |
| Allison-Robinson House |
| Allman, Walter, House |
| Alpha Tau Omega Fraternity House |
| Ambassador |
| American House Hotel |
| American Sheet and Tin Mill Apartment Building |
| American Trust and Savings Bank (Indiana Bank) |
| Ames Family Homestead |
| Amoss, James M., Building |
| Amo THI & E Interurban Depot/Substation |
| Anderson Bank Building |
| Anderson Downtown Historic District |
| Anderson High School Wigwam |
| Anderson-Thompson House |
| Angola Commercial Historic District |
| Annadale |
| Apple, Christopher, House |
| Arch in the Town of Marshall |
| Argos Downtown Historic District |
| Argos Izaak Walton League Historic District |
| Arnold, Dr. John, Farm |
| Arnold, Isaac and Ruth, House |
| Ashby |
| Askren, Thomas, House |
| Aston Inn |
| Athenaeum (Das Deutsche Haus) |
| Atkinson, Josephus, Farm |
| Attica Downtown Historic District |
| Attica Main Street Historic District |
| Attucks, Crispus, High School |
| Auburn Community Mausoleum |
| Auburn Cord Duesenberg Automobile Facility |
| Aurora City Hall |
| Aurora Methodist Episcopal Church |
| Aurora Public Library |
| Auto Hotel Building |
| Ayres, L. S. Annex Warehouse |
| "B-17G ""Flying Fortress"" No. 44-83690" |
| Bailey, Louis J., Branch Library-Gary International Institute |
| Bailly, Joseph, Homestead |
| Baker |
| Baldwin Addition Historic District |
| Ball, Judge Cyrus, House |
| Balmoral Court |
| Bals-Wocher House |
| Bankers Row Historic District |
| Barker House |
| Barker, John H., Mansion |
| Barnett-Seawright-Wilson House |
| Barnett, Thompson, House |
| Barr, Charles, House |
| Barrett's Britz Building |
| Bartholomew County Courthouse |
| Bartlett Real Estate Office |
| Bass, John H., Mansion |
| Bates-Hendricks House |
| Battell Park Historic District |
| Battle Ground Historic District |
| Baugo Township Gymnasium |
| Baum-Shaeffer Farm |
| Bayard Park Historic District |
| Beard-Kerr Farm |
| Beardsley, Albert R., House |
| Beardsley Avenue Historic District |
| Beardsley, Dr. Havilah, House |
| Beck's Mill Bridge |
| Bedford Courthouse Square Historic District |
| Bedford, William, Sr., House |
| Beech Grove Cemetery |
| Beechwood (Isaac Kinsey House) |
| Beem, David Enoch, House |
| Beeson Bridge |
| Beiger House |
| Bentel, George, House |
| Benton County Courthouse |
| Benton House |
| Benville Bridge |
| Bergan, W.N.-J.C. Lauber Co. Building |
| Bernardin-Johnson House |
| Berteling Building |
| Bethany Congregational Church |
Data from United States Park Service and Wikidata
