DCA has two. Or are we not counting Mermaid?
No, we're not counting DCA's Little Mermaid.
Nor are we counting the cloned version they built in Card Walker's Magic Kingdom Park out in the swamp.
We're only counting Walt Disney era dark rides; two-to-six passenger vehicles travelling along a little bus-bar ride system in the dark. Usually in Fantasyland, and always dealing with animated motion pictures.
Little Mermaid is an Omnimover, like The Haunted Mansion, or various versions of Buzz Lightyear, or Adventure Thru Inner Space, Presented by Monsanto or that lame Eastern Airlines version they had in WDW.
Since this is the Disneyland side of this forum, we are using the traditional Disneyland definition of a "Dark Ride". Disneyland has seven (7!) of them, with an extra in DCA. WDW only has two left, and they have four of them in Tokyo, and only one or two each in Paris, Hong Kong and Shanghai. It's an art form that Walt Disney and his team elevated and refined in the 1950's, and Disneyland is the powerhouse when it comes to them. Dark rides!