Yes, "one-room schoolhouse" has hyphens. The hyphen is used to connect the words "one" and "room" to indicate that they work together as a single adjective describing the noun "schoolhouse." This formation clarifies that it is a schoolhouse with only one room.
Sonic's Schoolhouse was created in 1996-11.
she lived in grand praire
Ames Schoolhouse was created in 1898.
Montrose Schoolhouse was created in 1909.
Weston Schoolhouse was created in 1870.
Rippleton Schoolhouse was created in 1814.
Fruita Schoolhouse was created in 1895.
Square Schoolhouse was created in 1850.
Snyderville Schoolhouse was created in 1860.
Verdoy Schoolhouse was created in 1910.
Schoolhouse Blizzard happened in 1888.