There are currently 14 historic districts within the city of Royal Oak that have been designated as such by the HDSC. These districts are listed in the Royal Oak municipal code Ch. 82, Articles IV-XVI:
- Royal Oak Savings Bank Block (at the southwest corner of Fourth and Main Streets and Haberman's Fabric Store at 117 West Fourth Street-originally known as the A.G. Miller Building).
- Hilzinger Block Building (106-110 South Main Street)
- B&C Grocery Store (417, 419 and 421 South Main Street and 101 East Fifth Street”)
- Royal Oak Woman’s Club (404 South Pleasant Street)
- McDowell House (402 North Troy Street)
- Orson Starr House (3123 North Main Street)
- George and Anna Hilzinger House (211 Knowles)
- Stauch House (4620 Elmhurst Avenue)
- Hermann’s Bakery (317 South Main Street)
- Baldwin Theater (415 South Lafayette)
- Knowles House (524 East Lincoln Avenue)
- Fleming Goodrich House (319 Crane Avenue)
- L.A. Young Historic District (11 homes on North Altadena Avenue: 1016, 1021, 1036, 1107, 1110, 1111, 1114, 1115, 1118, 1122, 1123)
- Royal Oak Farmers Market (3166 East 11 Mile Road) - in the process of being added to code